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Health at 39
What is due at 39: Your thirties — sleep 7-9 h, protein 0.8 g/kg, plus the screenings and checks of the decade.
Your thirties
The slow decline begins — about 3-8% of muscle per decade without training, and recovery gets a day slower. Sleep gets shorter for structural reasons (children, work) exactly when the body starts needing its full amount. This is the decade where training becomes maintenance, not vanity.
| Your numbers at 39 | Value |
|---|---|
| Sleep need | 7-9 h |
| Protein target | 0.8 g/kg |
| Estimated max heart rate | 181 bpm (220 − age) |
Screenings due this decade
- Blood pressure — every year.
- Cholesterol and blood glucose — once this decade, to catch the early risers.
- Cervical screening (women) — on the national schedule.
- Mental health — the thirties are the commonest onset decade for anxiety and depression; a check is a conversation, not a test.
Checks worth doing
- Blood pressure yearly; lipids and glucose once.
- Strength: can you still do the lifts you could at 28? If not, the muscle is already leaving.
- Sleep: seven hours most nights — protect it like a budget line.
The thirties are where "I feel fine" stops being a plan. The checks are cheap, the fixes are boring (protein, two strength sessions a week, a defended bedtime), and the payoff lands in the fifties and sixties.
Act on it
- Your calorie and protein needs — the calculator turns the grams into food.
- Fitness reference values — the tests behind the checks.
- Blood test reference ranges — what the results mean.
Reference, not medical advice. Follow your national screening programme's invitations and your clinician's schedule — this page summarises the published recommendations, it does not replace them.