Most of what you're hearing about GLP-1s and muscle is either fearmongering or pharma optimism. Project Aeterna gives you the actual picture — a research-grounded muscle function tracker built by NIH-funded gerontologists, benchmarked against women your age.
"Menopause is a muscle event, not just a hormone event. Every woman in our community deserves a real 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 real 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 population research · 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 real number. The test doesn't judge effort — it measures outcome. That difference is everything.
Find Out Where You Actually Stand →
Muscle is the organ of longevity.
Project Aeterna gives you the data to understand yours — 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.
For women 40 and over — whether navigating hormonal change, weight loss on GLP-1 therapy, or simply the biology of aging — muscle function is where the real story is. Strength, balance, and how easily you move decline in ways that often go undetected until the gap is wide. Project Aeterna measures exactly this, benchmarked against women your age using 25 years of published population data.
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 the science on muscle is more nuanced than headlines suggest. Most women preserve functional strength. But the picture varies significantly by age, baseline muscle mass, activity level, and whether you're also navigating hormonal change. Knowing which category you're in is the actual question.
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. 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 muscle aging, 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 muscle and bone aging, COVID-19-related muscle loss, and microbiota-derived compounds that extend lifespan and improve muscle and bone health. Publications active through 2026.
Topics include muscle aging, 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 treat all women the same. Project Aeterna Premium takes a different approach — it estimates how your specific hormonal profile, interventions, and inputs relate to strength and mobility, using a neural network trained on published intervention research. It's a model estimate personalised to your inputs, not a clinically validated prediction.
The model estimates how your strength and mobility may change over the next 3–5 years — and what you can do to influence the outcome. Tell it what you're already doing (HRT, GLP-1, resistance training, supplements) and it shows you how that changes the estimate.
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 the screen to count each stand. 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 specialist equipment — in under two minutes.
Premium adds biological age modelling and 5-year trajectory.
Simple, research-grounded input. Hold your phone and tap +1 each time you stand — matching the original observer-count method from the Rikli & Jones validation. This tap-based rep count is the same count used in NHANES normative comparisons.
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.
A 20+ year longitudinal cohort tracking women through the menopause transition. Greendale et al. (2019, JCI Insight) grounds how the model weights strength and lean-mass change by menopause stage; Solomon et al. (2022, JAMA Network Open) is the published 10-year cohort data behind Pro's physical-function outlook.
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, mobility, and quality of life. It has been validated across multiple studies, referenced in NHANES normative data, and used in research worldwide.
Research is increasingly clear that muscle function declines in ways that often go undetected — accelerated by hormonal change, weight loss interventions, and the natural biology of aging after 40. 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.
This is where SWAN — the 20+ year Study of Women's Health Across the Nation — matters: it's the specific longitudinal evidence the model draws on for how strength and lean mass change through the menopause transition, not just general aging research.
The tap-to-count input method is actually closer to the original Rikli & Jones observer-count methodology than an automated sensor would be. 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. Sit-to-stand data is analysed in real time and not stored. 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. Momentous’s women’s supplement line was developed in collaboration with Dr. Stacy Sims, whose research on female physiology and GLP-1 interactions directly informs our GNN model — and whose Collective X Health partnership with Momentous is actively funding new female performance research that underpins these recommendations.
If you're an RD, personal trainer, or clinician working with women on GLP-1 therapy, menopause, or healthy aging — your clients are asking questions you can't fully answer without a functional baseline. Project Aeterna gives you that baseline, grounded in the same NHANES and DrugBank data used in published research.
You provide the trust and the programming. We provide the musculoskeletal intelligence. Neither of us can do the other's job — and that's the point.
Talk to Us About Practitioner Access →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 · 25 years of published research
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.