There is no a handbook for growing up and old that I know of yet. There are so many things they just don’t tell you. Things that will predictably happen as you age. One thing I just learned about is Sarcopenia. From the time you are born to around the time you turn 30, your muscles grow larger and stronger. But at some point in your 30s, you start to lose muscle mass and function. The cause is age-related sarcopenia or sarcopenia with aging.
Physically inactive people can lose as much as 3% to 5% of their muscle mass each decade after age 30. Even if you are active, you’ll still have some muscle loss.
There’s no test or specific level of muscle mass that will diagnose sarcopenia. Any loss of muscle matters because it lessens strength and mobility.
Sarcopenia typically happens faster around age 75. But it may also speed up as early as 65 or as late as 80. It’s a factor in frailty and the likelihood of falls and fractures in older adults.
Keep active and lift and carry. Get a little weight bench for home if you can fit it in. Use it, or loose it!