08/19/2026
You lose 3 to 8% of muscle mass per decade after thirty, and it accelerates after sixty.
That number gets all the attention. It’s also the one that’s easiest to fix.
Collagen turnover in tendon is measured in years. Range of motion, once lost, takes one to two years to restore and frequently doesn’t come back fully. Strength after a layoff returns in six to eight weeks.
Six weeks against two years. That asymmetry is the whole thing, and almost nobody trains around it.
Most training after forty is nostalgia with a barbell attached. You’re chasing a number you hit in 2004, and every session gets graded against a version of you with different hormones, different tissue, and no job.
The seventy-year-old version doesn’t need that number. He needs to get off the floor without a plan. Carry both bags up the steps. Rotate his neck to check a blind spot.
Those are built out of connective tissue quality and range, both of which depend on repair keeping pace with load, and both of which take years to rebuild once they’re gone.
Which means the window to protect them is now, while there’s still something to protect.
The person you’ll be at seventy is being built today. None of the deposits feel significant when you make them. Ten minutes. One session. One week of not quitting.
You can’t train your way back to twenty. You can absolutely train your way into a seventy that still does things.
