Why Women Age Twice as Fast During Perimenopause - and What to Do About It

Perimenopause aging describes the accelerated shift in immune-driven biological aging that many women experience as they move from regular hormonal cycles toward menopause. This is where chronological age and biological age start to diverge: two women born the same year can be aging at very different speeds beneath the surface.

The main driver is estrogen. As levels decline, the immune system's control over inflammation weakens, and low-grade chronic inflammation, known as inflammaging, begins to climb. This shows up at a molecular level through glycans, sugar molecules on antibodies that regulate inflammation, shifting well before menopause is officially diagnosed.

For a fuller picture of how hormonal change, HRT, and biological age connect, read Menopause, HRT & Biological Age: The Definitive Guide to Tracking Hormonal Aging.

The study behind perimenopause aging

Researchers analyzed the IgG glycome in 5,080 samples from 1,940 female twins at multiple time points as they moved from regular hormonal cycles into menopause. The results showed that glycome aging speeds up considerably during perimenopause, more than at any other stage of adult life. Rather than a slow, steady drift, glycans changed at a distinctly higher rate in the years surrounding the menopausal transition compared with premenopausal women or men of a similar age. This is still an early finding, but it points to a clear direction for future research: the resulting rise in low-grade chronic inflammation may be one of the molecular mechanisms behind the increased health risks associated with menopause, including higher long-term risk for cardiovascular disease, bone loss, and cognitive decline.

Why perimenopause aging is so often missed

Perimenopause can last for years before a period actually stops, and it is notoriously difficult to diagnose in the moment. Joint pain, disrupted sleep, low mood, brain fog, and irregular cycles can all point to perimenopause, but they can just as easily be mistaken for something else entirely. It is not unusual for women to be told they have depression, fibromyalgia, or chronic fatigue long before anyone considers hormonal change as the underlying cause, and that delay can mean years of unmanaged inflammation before the right conversation happens with a doctor.

Biological age vs chronological age: why it matters in your 40s

Chronological age is simply how many years someone has been alive. Biological age reflects how well the body's systems, including the immune system, are actually functioning, and during perimenopause the two numbers can pull apart quickly. In GlycanAge testing, this shows up as a rise in the pro-inflammatory Glycan Mature index alongside a fall in the anti-inflammatory Glycan Youth index, and a woman's GlycanAge score can climb by more than a decade in a relatively short window, even though outwardly nothing may have changed yet. Framed this way, biological age becomes a number worth actively working to improve, rather than a fixed fact to accept.

"What we see in women during this perimenopause period is that glycans change very quickly, from glycans that suppress inflammation into glycans that promote inflammation."
— Prof. Gordan Lauc, Chief Scientific Officer, GlycanAge; Professor of Biochemistry and Molecular Biology, University of Zagreb

Why standard hormone tests miss perimenopause aging

Conventional hormone testing was never built to capture perimenopause well. Estrogen, progesterone, and follicle-stimulating hormone can swing dramatically within the same week, or even the same day, which makes a single blood draw an unreliable snapshot of what is actually happening.

"In the clinic, if I'm seeing women, even young women, I tend not to do blood tests because they don't help. What's really important is looking at their symptoms."
— Dr Louise Newson, GP and Menopause Specialist, Founder of Newson Health and the balance app

Because IgG has a half-life of around three weeks, glycan composition reflects average hormone exposure over that period rather than a single moment, offering a steadier signal through a stage of life defined by hormonal noise.

The perimenopause protocol: steps to slow biological aging

Knowing that perimenopause accelerates biological aging is only useful if it leads to action. A few evidence-informed steps can help support a slower rate of change during this transition, and none of them require waiting for a diagnosis to start.

Talk to a doctor about HRT. Since declining estrogen is the primary driver behind the inflammatory shift, replacing it under medical guidance is one of the most direct ways to address the root cause rather than individual symptoms as they appear. Research suggests that starting hormone replacement therapy earlier in the perimenopausal window is associated with a greater reduction in future disease risk than starting later.

Shift toward an anti-inflammatory way of eating. Prioritising vegetables, fiber, and marine omega-3 sources, while cutting back on ultra-processed food and added sugar, gives the immune system fewer inflammatory triggers to manage on top of the hormonal changes already underway.

Add regular, moderate resistance training. Muscle mass and bone density both decline faster once estrogen drops, so resistance training helps protect against that loss. Consistency matters more than intensity here: excessive, high-strain training can itself act as a pro-inflammatory stressor, so the goal is steady, moderate training rather than pushing harder.

Prioritize sleep and stress management. Poor sleep and chronic stress both independently raise inflammation, compounding the effect already driven by hormonal change, so protecting sleep quality and building in genuine downtime is part of the same inflammation picture.

Track the response, rather than guessing. A finger-prick GlycanAge test tracks glycan shifts directly, giving a consistent picture of immune-driven aging even while hormone levels fluctuate day to day. For women on HRT, retesting every three to four months can show whether a given dose or type is having a measurable effect on inflammation. For those working through lifestyle changes alone, a six to twelve month interval is generally more appropriate, since those changes tend to unfold more gradually. A self-booked result interpretation call is available to talk through what a given score means in context.

Perimenopause aging is not something that has to be managed passively. With the right combination of medical guidance, diet, movement, and consistent tracking, it is possible to actively influence how fast the body ages through this transition rather than simply waiting to see what happens. Ready to see where you stand? Book your GlycanAge test in the shop and start tracking your own biological age through this transition.

External sources

• Deriš H, Kifer D, Cindrić A, Petrović T, Cvetko A, Trbojević-Akmačić I, Kolčić I, Polašek O, Newson L, Spector T, Menni C, Lauc G. Immunoglobulin G glycome composition in transition from premenopause to postmenopause. iScience. 2022;25(3):103897. Link: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8881712/

• Jurić J, Kohrt WM, Kifer D, Gavin KM, Pezer M, Nigrovic PA, Lauc G. Effects of estradiol on biological age measured using the glycan age index. Aging (Albany NY). 2020;12(19):19756-19765. Link: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7732334/

• Hoshi RA, Plavsa B, Liu Y, Trbojevic-Akmacic I, Glynn RJ, Ridker PM, et al. N-Glycosylation Profiles of Immunoglobulin G and Future Cardiovascular Events. Circ Res. 2024;134(5):e3-e14. Link: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10923145/

• Franceschi C, Garagnani P, Parini P, Giuliani C, Santoro A. Inflammaging: a new immune-metabolic viewpoint for age-related diseases. Nat Rev Endocrinol. 2018;14(10):576-590. Link: https://pubmed.ncbi.nlm.nih.gov/30046148/