Muscle loss in aging tied to nerve loss

PHILADELPHIA (WPVI) -- If your legs are getting weaker as you get older, you're not alone and British researchers believe it's due to a loss of nerves.

In tests, they found that young adults have 60 to 70 thousand nerves controlling leg movement, but that number drops nearly a third by age 75.

It drops even more in adults who aren't physically active.

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