Muscle power — how fast you can use your muscles — might be a better sign of how long you'll live than just how strong your muscles are, because it shows how well your body can handle real-life...

For middle-aged and older adults, how fast your muscles can generate power might be a better sign of how long you'll live than how strong they are — especially in men.

The stronger your upper body muscles are — even just a little bit stronger — the lower your chances of dying from any cause, and this seems to be true no matter how strong you already are.

As people get older, their muscles lose power — but how that happens changes over time. Younger adults mostly lose strength, while older adults lose both strength and speed, meaning different things go wrong in the body as we age.

In older adults, how fast muscles can generate power matters more for staying steady on your feet and avoiding falls than how strong or big the muscles are — and it drops faster as you age.