Over Fifty Fitness starts with data. Project Aeterna is a free 30-second assessment built by NIH-funded gerontologists — it tells you exactly how strong, stable, and capable your body is compared to women your age, and what to do next.
"Menopause is a muscle event, not just a hormone event. Every woman in our community deserves a clinical baseline — not guesswork."
PJ Wren · Founder, Over Fifty Fitness · 1,550+ workouts for women 40+
Most women in the Over Fifty Fitness community assume they're "doing fine." The test often reveals hidden deficits in strength, power, or balance — the exact things that determine long-term independence. Knowing your number changes what you train for.
PJ's Over Fifty Fitness community is built around active women who want to push further. Project Aeterna gives those women a clinical baseline — a Mobility Age score drawn from 25 years of published gerontology research. Together, the data and the programming create something neither delivers alone.
Illustrative example based on clinical data · Individual results vary
"Most women in this programme think they're doing everything right — until they see their Mobility Age."
Not because they're not trying. Because no one has ever given them a clinical number. The test doesn't judge effort — it measures outcome. That difference is everything.
Find Out Where You Actually Stand →
Menopause is a functional event as much as a hormone event.
Project Aeterna gives you the data to understand it — and act on it.
Most health platforms track weight, steps, and sleep. None of them measure what actually predicts long-term independence: how strong, stable, and capable your body is in everyday life.
Menopause doesn't just change your hormones — it changes how strong and stable your body feels. Strength, balance, and how easily you move are where the menopausal transition leaves its clearest mark. And these changes often happen long before the scale or a mirror would tell you anything. As researcher Stuart Phillips has noted, this is where menopause exerts its most important effects — and it's exactly what Project Aeterna measures.
The good news: these changes are measurable early, and early action makes the biggest difference.
GLP-1 medications like Ozempic and Mounjaro are remarkably effective at reducing weight — but they don't distinguish between fat and muscle. For women in menopause, who are already losing muscle faster than at any other point in their lives, this creates a compounding risk most doctors aren't measuring.
A Mobility Age test every 8–12 weeks is the earliest signal that muscle is being protected — or lost.
"The women most at risk are the ones who feel like it's working — because the scale is moving. But if you're losing muscle, not fat, the number that matters is your Mobility Age, not your weight."
Project Aeterna Research Team
Project Aeterna was built by researchers who have spent careers studying exactly what happens to strength, balance, and physical capacity as women age through menopause. The science isn't adapted from general wellness research — it is the research. Every metric, every normative table, every recommendation traces back to peer-reviewed publications from this team or the foundational studies their work builds on.
Distinguished scientist and researcher specialising in the cellular and molecular biology of muscle and bone aging. Research spans sarcopenia, longevity interventions, the kynurenine pathway, and sex-specific muscle transcriptomics. Active publications through 2025–2026 in Geroscience, Biochimie, and JCI Insight.
Section Chief of Endocrinology, specialising in regenerative medicine, bone health, and the biological mechanisms of healthy aging. Co-investigator on NIH-funded studies of musculoskeletal aging, dietary interventions, and the role of tryptophan metabolism in lifespan extension.
Expert in cellular biology of musculoskeletal aging. Co-author on studies of lipid metabolism in sarcopenia and osteoporosis, COVID-19-related muscle loss, and microbiota-derived compounds that extend lifespan and improve muscle and bone health. Publications active through 2026.
Topics include sarcopenia, longevity interventions, tryptophan and kynurenine metabolism in aging muscle, sex-specific muscle transcriptomics, lipid metabolism in age-related musculoskeletal disorders, and microbiota-derived compounds that improve muscle and bone health. Continuously NIH-funded for over a decade.
No signup · No equipment · 90 seconds
Most longevity apps ignore menopause entirely. Project Aeterna Premium is built differently — it models what actually happens to your strength and mobility during the menopausal transition, not just population averages.
We use advanced modelling to predict how your strength and mobility may change over the next 3–5 years — and what you can do to improve the outcome. Tell it what you're already doing (HRT, GLP-1, resistance training, supplements) and it shows you how that changes your trajectory.
No other consumer health app models this. It exists because the research team that built it has spent decades studying exactly these mechanisms.
Age, height, weight, and menopause stage. Four questions that personalise your score against age-matched peers drawn from NHANES population data.
Processed on your device. Never transmitted or stored.
Stand up from a chair fully, sit back down — as many times as you can in 30 seconds. Tap to count, or use your phone's motion sensor. No equipment needed.
Rikli & Jones (1999) 30-second chair stand protocol.
Your mobility age. Your peer percentile. One clear action to take next. Data that previously required a clinical appointment — in under two minutes.
Premium adds biological age modelling and 5-year trajectory.
Two input methods, same clinical output. Hold your phone and tap +1 each time you stand — matching the original observer-count method from the Rikli & Jones validation — or tuck your phone in your waistband for automatic motion-sensor counting. Both produce the same rep count used in NHANES normative comparisons. The tap method is closer to how the original clinical research was conducted.
The free test gives you real, useful data. Premium and Pro are annual plans — no monthly billing, no recurring surprises.
✦ Use code OFF for $49/yr
✦ Use code OFF for $99/yr
The free test tells you where you are today. Premium shows you where you're headed — and what changes your trajectory.
Input what you're already doing — HRT, GLP-1, creatine, resistance training — and watch your 5-year forecast update in real time. This is the conversation your doctor should be having with you.
Unlock Premium — $99/year →Annual plan · Cancel anytime · $8.25/month
Most women take the free test, see their number — and then want to know: is it going to get worse? Premium answers that. It shows where your strength and mobility are headed over 5 years, and tells you exactly which one change would make the biggest difference.
$8.25/month · Cancel anytime · Built on published research
Published in the Journal of Aging and Physical Activity. Established normative data and test-retest reliability for the STS protocol. This is the study your score is built on.
Your percentile is drawn from the National Health and Nutrition Examination Survey — real population data from real women your age, stratified by BMI and menopause stage.
The team's most recent work — published in Biochimie and Geroscience — directly informs the intervention recommendations and the GNN biological age model used in Premium.
The Premium model is trained across 12 hallmarks of aging including mitochondrial function, cellular senescence, and inflammation — personalised to your intervention profile and menopause stage.
The sit-to-stand test has been a standard tool in gerontology for 25 years. It measures lower body strength and power — and correlates strongly with long-term independence, fall risk, and quality of life. It has been validated across multiple studies, referenced in NHANES normative data, and used in clinical assessments worldwide.
Research is increasingly clear that menopause affects how strong and stable your body feels — often before any change in weight or appearance. The sit-to-stand protocol captures this directly. When the app recommends a specific action, that recommendation traces back to peer-reviewed evidence — not a wellness algorithm.
The tap-to-count input method, which is the default, is actually closer to the original Rikli & Jones observer-count methodology than automated sensor counting. The rep count is the rep count. The NHANES normative tables don't care how it was recorded.
Take the Free Test →All test processing happens locally on your phone. Motion sensor data is analysed in real time and immediately discarded. We never collect your health data, location, or any biometric information. No account or email required to take the test.
Your Mobility Age reveals where you're losing ground. The science is clear on two inputs that directly support muscle function — and both are chronically under-consumed by women after 40.
We partnered with Momentous because their products are third-party tested, NSF Certified for Sport, and built on the same peer-reviewed research base we use at Velogenix.
90 seconds, a chair, and your phone. Get your mobility age, your peer percentile, and one evidence-based action — emailed to you instantly.
Takes 90 seconds · No equipment · 100+ women tested
We're researchers first. If you have questions about the science behind your score, want to report a bug, or are interested in partnering with Velogenix — we'd like to hear from you.