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Forty to Sixty

Energy and strength at 40 to 60: muscle, bone, protein, and the number that moves when the scale doesn't

Muscle mass and strength peak around 30 to 35 and decline from there; bone loss is fastest in the years around menopause. Neither shows on a scale. This section covers what the evidence says about strength work, protein and bone, and the tiredness that deserves a test rather than a shrug.

Cobalt dumbbells, a yellow exercise mat and a white towel on a terrace.

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Seven ordinary things, one a day, for the 3 a.m. wake-ups, with sources you can read for yourself. Get the free 7-Day Midlife Sleep Reset.