Future You: See Your Fitness at 50, 60 and 70

See what your fitness could look like at 50, 60, 70 and 85. Future You draws two paths for your cardio fitness and muscle strength, keeping going as you are or starting cardio and strength training now, using published research on ageing, and shows which everyday tasks each path keeps within reach.

Ageing simulator

Meet your future self

Four quick answers. We draw your likely cardio fitness and strength from today to age 85, two ways.

Your age and sex

Ages 30 to 75.

How active are you now?

Know a fitness number? (optional, makes it personal)

Compared with people your age, your strength is

Think carrying heavy shopping, getting up off the floor, opening jars. Not sure? Leave it on average.

Age70

Cardio fitness (VO2 max)

Estimated VO2 max in ml/kg/min. The shaded zone sits below the independence line, the level where everyday life starts to get hard. Drag across the chart to scrub through the years.

Muscle strength

Overall strength as a percentage of the average young adult’s peak. The shaded zone sits below the low-strength line doctors use to screen for sarcopenia (age-related muscle loss).

What you can still do

How six everyday tasks feel on each path. Top bar: without training. Bottom bar: with cardio and strength training. The dark line is the age you picked.

ComfortableHard workAt or beyond your limit

Share your Future You

How we model this

Your starting cardio fitness is the VO2 max you enter. If you give a resting heart rate instead, we estimate it with the heart rate ratio method (Uth 2004): 15.3 × max heart rate ÷ resting heart rate, with max heart rate = 208 − 0.7 × age (Tanaka 2001). With no number, we start you at the median for your age and sex in the FRIEND registry (Kaminsky 2022).
How cardio fitness ages comes from the Aerobics Center Longitudinal Study, which followed more than 20,000 adults (Jackson 2009). It found fitness drops by about 4% per decade in your 40s, 7–8% in your 50s, 12% in your 60s and 17% in your 70s. We carry that trend past 80 (about 22% per decade by 85), in line with the Baltimore study’s finding of more than 20% per decade from the 70s on (Fleg 2005). Before 45 we use the 40s rate.
Training does not stop ageing. Decline happens at every activity level (Fleg 2005; Hawkins and Wiswell 2003), so both lines fall. We only assume training lifts you higher: VO2 max rises about 16% when inactive adults start endurance training (Huang 2005 meta-analysis). We phase it in over the first year and assume you keep training.
Independence line: 18 ml/kg/min for men and 15 for women. Below this, losing independence becomes likely (Shephard 2009).
Strength follows the grip strength centile that matches your answer (much weaker 10th, weaker 25th, average 50th, stronger 75th, much stronger 90th) from over 60,000 measurements in 12 British studies (Dodds 2014). Grip is the standard marker of overall strength. We show it as a percentage of the young-adult peak (51.9 kg for men, 31.4 kg for women).
Strength training adds 24%: the smallest of the average gains (24–33%) in a meta-analysis of strength training in adults aged 50 to 92 (Peterson 2010). The low-strength line is the European sarcopenia grip cut-off of 27 kg for men and 16 kg for women (EWGSOP2), about 52% of the young-adult peak.
Everyday tasks use energy costs from the 2024 Adult Compendium of Physical Activities (1 MET = 3.5 ml/kg/min). Following the ACSM intensity bands, a task is comfortable at up to 63% of your VO2 max, hard work at 64–90%, and at or beyond your limit above 90%.
If you already train, your path is the orange line, and the blue line reverses the same training gains to show what stopping could cost.
Not modelled: weight change, illness, injury, medication, smoking and genes. People vary a lot, so treat this as an illustration of averages, not a forecast for you.

An illustration, not a prediction or diagnosis. These lines show population averages from research, not your personal future. Before starting hard training, check with your doctor if you have a heart condition, chest pain, dizziness or unusual breathlessness on effort, high blood pressure, diabetes, or take heart medicines such as beta-blockers (they also make heart-rate estimates unreliable).

Next step: change your line

Measure your real starting point with the fitness test or the fitness age calculator, then come back and enter your number.
Start the strength side with the 12-week strength program, and set your easy cardio pace with the zone 2 heart rate calculator.
Read how to raise your VO2 max after 35 and strength training after 35.

How the Future You simulator works

Two things predict how well you will move in your 70s and 80s better than almost anything else: your cardio fitness (VO2 max), the most oxygen your body can use, and your muscle strength. Both fall with age, and the fall speeds up later in life. Future You takes your starting point, applies the average rates of change measured in long-running studies, and draws two lines to age 85: one if you keep going as you are, and one if you add regular cardio and strength training now.

The gap between the two lines is what training buys you. Because the same ageing rate applies to both lines, the result is deliberately cautious: we never assume that training slows ageing itself, only that it lifts you to a higher line. The tool then turns those numbers into plain language, such as when carrying a suitcase upstairs is likely to turn from comfortable into hard work.

What the research says

Cardio fitness falls faster as you get older. In the Baltimore Longitudinal Study of Aging, which retested 810 healthy adults over many years, VO2 max fell by about 3–6% per decade in people’s 20s and 30s but by more than 20% per decade from their 70s onwards, at every level of physical activity (Fleg 2005).

There is a line you do not want to cross. Exercise physiologist Roy Shephard estimated that losing independence becomes likely when VO2 max falls below about 18 ml/kg/min in men and 15 in women, which the average person reaches at 80–85. He also argued that regular aerobic exercise could cut your biological age by 10 or more years and extend independence by a similar amount (Shephard 2009).

Fitness is strongly linked to a longer life. In a meta-analysis of 33 studies, each 1-MET higher fitness level (3.5 ml/kg/min) was linked to a 13% lower risk of death from any cause (Kodama 2009). In more than 122,000 patients who had a treadmill test, those with low fitness had about five times the risk of death of those with elite fitness, with no upper limit to the benefit (Mandsager 2018). These are associations in large groups, not a personal risk score.

Strength fades even faster than muscle. Around age 75, men lose about 3–4% of their strength a year and women about 2.5–3%, two to five times faster than they lose muscle mass (Mitchell 2012). Strength training reverses part of that: adults aged 50 to 92 gained 24–33% strength in about four months (Peterson 2010).

How to move onto the better line

The World Health Organization recommends 150–300 minutes of moderate activity or 75–150 minutes of vigorous activity a week, plus muscle-strengthening work on two or more days. A simple start: three easy zone 2 sessions a week where you can still talk, one session of harder intervals once you have a base, and two full-body strength sessions built around squats, hinges, pushes, pulls and carries. Re-test every 8–12 weeks and watch your own line move. For the details, read zone 2 training for men over 35, how to start working out after 40 and longevity habits that matter.

Sources

Future You gives general education, not medical advice. It shows averages from published studies and cannot predict your health or diagnose any condition. Check with your doctor before starting a new training plan, especially if you have a heart condition or take medication.

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