Fertility Myths vs. Modern Reality

Fertility is back in the spotlight, with headlines focusing on falling birth rates across the UK and beyond. Often, the conversation centers on why women aren’t having children—from financial pressures to changing life priorities. But that’s only part of the story: what about men?

This debate frequently overlooks a crucial issue: the increasing disconnect between biological fertility windows and the timelines of modern life. It’s not solely about financial choices; there is also a growing conflict between human biology and the realities of building a career, securing housing, and finding a partner in today’s world.

Eve, Clue’s resident fertility nurse and senior reproductive health advisor, brings clarity to the conversation in this Q&A. She breaks down how fertility really changes with age, what’s within (and beyond) our control, the social and economic factors at play, and how understanding your body can empower people to make informed reproductive decisions.

1. Many people believe female fertility suddenly drops after 35. What does research actually show about how fertility changes with age?

It’s a common misconception that fertility suddenly drops off a cliff after 35.  In reality, fertility gradually declines, and at different speeds for different people.

Most women experience a slow decline through their 30s, followed by a steeper drop in their late 30s and early 40s as egg quantity and quality decrease. Research shows that at age 30, your chance of getting pregnant each cycle is roughly 20–25%; by 40, it’s about 5–10%. 

These numbers sound scary, but this curve isn’t the same for everyone, and many people are still able to conceive well into their 40s. Genetics, health conditions, and even family history can influence how early or late fertility changes happen. 

• Family history: If your mother, aunts, or sisters entered menopause early or had difficulty conceiving, you might be more likely to experience the same. 

• Medical conditions: Premature ovarian insufficiency (POI), when the ovaries stop functioning normally before age 40, sometimes runs in families and may have a genetic component. Endometriosis can also accelerate fertility decline. 

• Lifestyle and environment: Factors such as chronic stress and smoking can also accelerate that decline. 

So while averages are helpful for public health, your personal timeline may differ. Tracking your cycles over time and learning your family history can help you spot changes early and make informed choices. 

Are you trying to get pregnant? Clue Conceive can help.

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2. How much of declining fertility is caused by biology versus social or economic factors?

Both biology and social or economic factors play a role in declining fertility, and they interact closely. Biology sets the boundaries, but social and economic factors often dictate the timing of when people try to have children. 

Across much of Europe and the UK, people are having children later due to rising costs, job insecurity, and the challenges of balancing parenthood with careers. At the same social norms and values have shifted. Today’s generation is very different from the baby boomers, who typically had children much earlier. The old expectation that women should marry young and start a family right away simply doesn’t fit modern life. 

People are now choosing to prioritize education, personal growth, career development, and emotional readiness before parenthood. As a result, many start trying in their mid- to late 30s and 40s. Fertility at this stage can simply be more variable, which makes awareness and open conversation even more important. And while fertility awareness can’t fix those systemic barriers, it can help people plan more realistically within them. 

3. How does male fertility decline affect conception rates, and why is fertility often framed as a woman’s issue?

Yes. Fertility has long been treated as a “woman’s issue,” but research shows that male factors contribute to roughly half of all fertility problems, and are the sole cause in up to 20% of cases. It’s a shared problem, yet the clinical and cultural focus has historically disproportionately leaned towards women.

While men produce sperm throughout their lives, sperm quality does decline with age. Measurable changes in sperm concentration, shape, and movement typically begin after age 35, and become more pronounced after 40. 

Older men often have lower sperm count, more DNA damage, and reduced semen volume. These changes can impact conception and increase the chance of miscarriage. 

Research also shows that advancing paternal age, particularly beyond age 45, can carry genetic implications for offspring. Studies have linked older paternity with a slightly higher risk of conditions such as autism spectrum disorder, schizophrenia, and achondroplasia.

Hormonal changes play a role, too. Testosterone levels gradually decline with age, which can affect sexual function and sperm quality. 

Lifestyle and environment add another layer; factors like heat exposure, smoking, alcohol use, stress, and obesity all can impact sperm health and hormonal balance.

From a public health perspective, this is why fertility literacy must include men. The more men understand how their own biology changes with age, the better equipped they are to take preventative steps. Fertility is a partnership, and we need to normalize seeing both people as patients and active participants. 

4. What are the most common misconceptions about fertility, and what does science actually say?

Myth: “Fertility falls off a cliff after 35.”

Reality: Fertility declines gradually over time, and everyone’s timeline is different. 

Myth: “IVF can fix age-related fertility.”

Reality: IVF can help with conception, but success depends on egg and sperm quality. It doesn’t fully overcome age-related fertility decline.

Myth: “Egg freezing is an insurance policy.” 

Reality: Freezing eggs can extend options, but age and egg quality still matter, and it’s never a guarantee.

Myth: “Men are always fertile.” 

Reality: Male age, health, and lifestyle impact fertility. Male factors contribute to about 50% of all infertility cases.  

Myth: “A healthy lifestyle guarantees fertility.” 

Reality: A healthy lifestyle can improve the odds, but cannot override age, genetics, or underlying health conditions. Eating a balanced diet rich in fruits, vegetables, whole grains, and lean proteins, and lower in saturated fats and processed meats, is associated with better sperm quality and hormonal balance. Avoiding or quitting smoking helps, too. Regular moderate exercise, maintaining a healthy weight, getting enough sleep, and limiting alcohol intake all support reproductive health in both men and women. For men, avoiding anabolic steroids is essential, as they can suppress sperm production entirely.

5. With fewer people starting relationships or feeling ready for parenthood, how do social and emotional factors interact with biological fertility?

Modern relationships are forming later, and that inevitably shapes when people can even start thinking about having children. You might be biologically ready in your 20s, but emotionally or financially unprepared for children. This mismatch between biological fertility and life circumstances is becoming more common. 

Stress, relationship instability, and burnout also affect reproductive health. Chronic stress, for example, can alter hormone levels, delay or suppress ovulation, and impact sperm quality. When couples are trying to conceive, that stress can easily turn into a feedback loop. Fertility challenges can create emotional strain, which in turn can affect intimacy, communication, and potentially even fertility itself. 

As a fertility nurse, I’ve seen how important it is to recognize and break that cycle. Getting the right support, whether that’s counselling, rest, or just open conversation, can help couples manage the emotional side of fertility. Fertility isn’t just about biological capacity – it’s intertwined with mental health, relationship wellbeing, and the social context people are navigating. 

6. We’re seeing rising rates of unplanned childlessness even though people still want children. How does fertility awareness (or lack of it) contribute to this trend?

In my experience as a fertility nurse, lack of awareness plays a huge role in unplanned childlessness. I’ve spoken to so many patients who told me they simply assumed they had more time to conceive. They didn’t realize how gradually, yet significantly, fertility changes with age, or how long it can take to conceive, even when everything looks healthy on paper.

There are also common misconceptions that fertility treatments like IVF or other assisted reproduction methods can solve age-related fertility issues. In reality, success rates decline sharply as egg quality decreases. By the time many people seek help, options like egg freezing or assisted reproduction may be less effective than they expected. 

Starting fertility education much earlier, ideally in your 20s, doesn’t mean pressuring people to have children sooner. It’s about giving them the information to plan on their own terms, with time and choice on their side. 

7. How might understanding your menstrual cycle earlier in life—not just when trying to conceive—help people make better reproductive health decisions over time?

Your menstrual cycle is one of the best indicators of your overall health. It reflects how your hormones, metabolism, and stress systems are working together. It can also offer early cues about changes in your reproductive health long before you start thinking about conception.

By tracking over time, you get to know what’s normal for you, and you’ll be able to spot when something changes. Irregular cycles, skipped periods, or new cycle-related symptoms can sometimes point to underlying issues like thyroid imbalance, PCOS, or early signs of changes in ovarian function. Knowing your baseline helps to notice those changes and speak to a healthcare provider before they become more serious. 

Cycle awareness isn’t just about fertility—it’s about building a long-term picture of your health and using that knowledge to make informed and proactive decisions. And when the time does come to start trying for a pregnancy, that awareness can make the process smoother. Tools like Clue Conceive build directly on this foundation, helping people identify fertile windows and understand how factors like timing, cervical fluid, and symptoms fit together, ultimately helping to increase the odds of success. 

8. How are cycle and fertility tracking apps like Clue evolving beyond period and ovulation prediction to help users understand broader reproductive health patterns and hormonal changes over time?

Tracking apps like Clue are evolving from simple period or ovulation prediction tools into comprehensive reproductive health trackers. People are increasingly interested in understanding broader patterns in their hormonal health, emotional wellbeing, and physical energy. 

Recent Clue data shows this change is already happening: in the last 90 days, 62% of users tracked categories beyond period or spotting, with the most commonly tracked categories being Pain (47%), Feelings (40%), Energy (25%), and Sex Life (23%). That’s a clear sign that users are thinking beyond menstruation and observing how their cycles affect their emotional well-being, energy levels, and relationships.

People are using Clue to track things like sleep, mood, libido, and energy, and to notice how these patterns change not only across their cycle, but over the years. This helps them recognize the subtle hormonal shifts that can appear well before significant transitions, like perimenopause.

It’s a move from simple prediction to self-awareness. Long-term gives people valuable context to bring to healthcare appointments, helping them talk about their fertility, hormones, or symptoms with more confidence and detail. As a fertility nurse, I’ve found that those conversations are often more productive when patients already have that insight into their own patterns. 

9. Can long-term cycle tracking help identify early signs of reduced fertility or the transition into perimenopause?

Potentially, yes—long-term tracking is emerging as a valuable tool for spotting early reproductive changes. That’s one of the most exciting areas of progress. In clinical practice, we know that subtle changes in cycle length or regularity can often appear several years before perimenopause begins. Tracking those shifts over time can help people recognize when their hormones may be starting to change and prompt timely conversations with their healthcare provider.

From a clinical perspective, it’s important to set expectations: tracking data can guide awareness, but should not provide a diagnosis. Apps can highlight trends like shorter cycles or new irregularity, but only a healthcare professional can confirm what’s happening through hormone testing and medical history.

Used together, technology and clinical care can help people understand their reproductive health in context, catching early changes before they become disruptive or distressing. 

10. How can technology help close the fertility information gap for both women and men, especially given the limited data available on male fertility?

There’s huge potential for technology to improve fertility understanding for both men and women, and we’re already seeing the shift.

Traditionally, when a couple struggled to conceive, it was the woman who underwent testing first, which can be an invasive, lengthy, and emotionally draining process. Only later, if no clear female cause was found, would the man’s fertility be assessed. That approach can not only delay diagnosis, but it also reinforces the idea that fertility is primarily a “female issue”, when in reality, male factors contribute to about 50% of all fertility challenges.

Today, technology is changing that. With the rise of digital clinics and at-home testing, men are becoming more active participants in fertility care. They can now order semen analyses, track sperm parameters, and access medical plans and results directly through online platforms. Having that visibility helps normalize male fertility conversations and reduces stigma, which makes men active partners in the process.

Fertility and health apps are evolving to reflect this shift. Men can now track factors like sleep, alcohol, and stress—all of which can affect sperm health and hormone balance. For women, long-term cycle tracking continues to shed light on ovulation, hormonal shifts, and signs of perimenopause. 

Where the potential really grows is when both sides connect. Tools like Clue Connect can allow couples to share cycle information safely, helping them recognize patterns together, from fertile windows and hormonal changes to how stress or sleep might be affecting timing and communication. That kind of shared visibility encourages emotional support and shared decision-making, making fertility a team journey rather than a solo responsibility. 

As a fertility nurse, I’ve seen how transformative it can be when both partners are informed and engaged. Technology has the power to close long-standing gender gaps in fertility understanding, creating a more balanced and supportive path towards conception and reproductive health.

11. How do lifestyle factors—stress, diet, exercise, alcohol, sleep— impact fertility? 

Lifestyle factors play an important role in overall fertility and reproductive health.  Maintaining a healthy weight, getting enough sleep, managing stress, not smoking, and limiting alcohol all support hormone balance and better-quality eggs and sperm. None of these reverse age-related decline, but they improve your chances at any age. 

12. How do environmental factors—such as pollution, endocrine disruptors, and chemical exposures—affect fertility, particularly sperm health?

Research suggests these exposures can influence fertility, especially sperm health, but they’re not the main driver of fertility decline. 

Still, minimizing exposure where possible can support overall reproductive health. Practical steps include: 

• Avoiding cigarettes and secondhand smoke

• Reducing plastic use

• Improving indoor air quality 

13. What are the most promising recent scientific developments in fertility research and reproductive longevity?

It’s an exciting time for the field of fertility science. We’re learning more about how fertility connects to overall health and aging. 

• Ovarian aging and genetics: Researchers are uncovering how ovarian aging is linked to cellular repair and metabolism, which could eventually help us understand why reproductive age varies so much between individuals. There’s growing interest in the role of genes involved in DNA repair and mitochondrial function, and how these influence the pace of egg aging and the timing of menopause. Understanding these mechanisms could open the door to new treatments that support reproductive longevity and overall health span.

• Male fertility: On the male side, scientists are developing better biomarkers of sperm quality, going beyond simple count and motility. They’re looking at DNA fragmentation, epigenetic markers, and oxidative stress, factors that can influence both fertility and offspring health. This could eventually make it easier for men to monitor their reproductive health more proactively. 

• Digital health data: Another area that’s changing the field is digital health data. Large, anonymized datasets from the likes of Clue are giving researchers access to real-world patterns across diverse populations. That can help us study menstrual and hormonal changes over time, identifying earlier signs of perimenopause, and better understand how lifestyle and environment interact with reproductive aging. 

All of this contributes to a more personalized view of fertility. The goal isn’t to extend fertility indefinitely, but to help people make informed choices and maintain reproductive health as a vital part of their overall wellbeing. 

14. What’s the one thing you wish more people understood about their fertility at different life stages?

Fertility is not guaranteed, nor does it disappear overnight. It changes gradually, and understanding it early gives you options. My message is always: fertility awareness shouldn't create fear—it should create freedom. When you understand your biology, you can make choices that fit your life, not the other way around. 

Key takeaways

Fertility is a shared journey that involves both women and men, and understanding the facts can help individuals make informed decisions. Factors such as age, genetics, and health influence fertility for everyone, but gradual changes are more common than sudden drops. While lifestyle choices and medical interventions can support reproductive health, they can’t override biology entirely.

In today’s world, socioeconomic factors often push family planning into later stages of life, creating a gap between biological readiness and external circumstances. Additionally, emotional factors such as stress and relationship stability play significant roles in fertility.

By separating myths from reality, using tools like cycle tracking, and taking a proactive, informed approach, people can navigate their reproductive choices with confidence and clarity.