The organ that ages first (and why it matters for everything else)

You probably know that menopause marks the end of menstruation, but the ovaries begin aging decades before that moment. And their decline affects the heart, the brain, the bones, and the metabolic systems that keep you well. 

This week, we’re taking a peek at the growing body of science around this subject.

👂Further listening: What your reproductive health says about longevity with Dr. Natalie Crawford.

We’ll be hearing from experts on topics like “Understanding Your Hormonal & Ovarian Clock”, “When Estrogen Leaves The Building”, and dozens of others that impact women’s health and aging well. These are conversations you won’t want to miss. 

Can’t make it to San Francisco? Our Inner Circle membership offers access to the full library of replays, among other benefits. Learn more.

“The ovaries are not just reproductive organs,” says Deena Emera, PhD, Senior Scientist and Writer-in-Residence in the Center for Reproductive Longevity and Equality at the Buck Institute for Research on Aging. The ovaries are the body’s most prolific hormone producers. The estrogen and progesterone they release signal tissues in the heart, brain, bones, blood vessels, and metabolic systems. 

But, “after menopause, the ovaries stop producing sex hormones in large quantities, which is associated with an increased risk of many chronic diseases, such as cardiovascular disease and dementia,” Emera says

This is well established in the research. What’s less well understood is why the ovaries age so much faster than other organs, and what (if anything) that faster timeline means for the rest of the body.

We’d love to know…

Most organs age roughly in sync with each other, but the ovaries are the exception. They begin their functional decline decades before any other major system shows meaningful deterioration, and a 2025 review in MedComm describes the ovary as “increasingly recognized as a regulator of systemic aging.” This suggests its functional decline may accelerate disease processes across multiple organ systems, well beyond the reproductive system.

“In most species, the reproductive system ages at the same rate as other systems in the body,” Emera says. “In humans, something unique has happened — aging of the reproductive system has been decoupled, at least partially, from aging of our other systems. In other words, our heart, brain, lungs, etc. have evolved mechanisms to stay healthy for longer than our ovaries.”

That decoupling, she suggests, may be less about ovaries failing early and more about everything else being protected to last longer. This distinction changes how we think about the event.

“We don’t know why women outlive their ovarian function,” Emera says. “There are many hypotheses.” The most widely discussed is the grandmother hypothesis, which proposes that extending lifespan beyond the end of a woman's reproductive years gives older women another way to contribute to their family's success — by helping raise grandchildren. But the evidence isn’t definitive.

What’s not in question is that menopause followed by a long post-reproductive life is a genuinely ancient feature of human biology. High infant mortality skews population averages downward, but adult women have always had post-menopausal life.

Whatever the causal direction, there are still downstream associations. When estrogen levels drop at menopause, physiological changes tend to follow: 

👉🏼 LDL cholesterol rises

👉🏼 Blood pressure creeps up

👉🏼 Visceral fat accumulates more easily, and 

👉🏼 Insulin sensitivity decreases

The timing of menopause appears to matter too. A 2026 study published in JAMA Cardiology found that premature menopause (defined as menopause before age 40) was associated with a 40% higher lifetime risk of coronary heart disease.

“These risks are well established in the West, but they are not universal,” Emera notes. “Modern hunter-gatherer women do not have increased risk of chronic diseases at menopause, suggesting that lifestyle factors play a major role.”

Here’s where the science gets more honest than most wellness content: when it comes to lifestyle interventions that protect ovarian aging, the research is still thin.

“The only lifestyle factor that consistently shows up as an accelerator of ovarian aging is smoking,” Emera says. “Menopause occurs earlier in smokers and in women whose mothers smoked during pregnancy.” Other factors may matter, but the supporting evidence isn’t there yet.

For everything downstream of ovarian aging — the cardiovascular, metabolic, and cognitive effects that follow the hormonal shift — the evidence for lifestyle intervention is much stronger. Strength training preserves muscle and bone. Consistent sleep protects metabolic function. Stress regulation matters for cortisol and insulin. And understanding your personal risk profile, especially if you experienced early or premature menopause, is a conversation worth having with your doctor.

The biggest takeaway from these early conversations? The post-menopausal body isn’t a broken reproductive system. It’s a system that evolved to keep going. How well it does depends on how well you support it.

Topics like this one, ovarian aging, hormonal health, longevity science, go deeper inside the Livelong Women’s Circle. If you’re looking for a smart, supportive space to ask questions and learn alongside other women who care about long-term health, join us!

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