The study also raises some cautionary questions about whether waiting until middle age or later to start exercising might prove to be challenging for the lifelong health of our muscles.

Physical aging is a complicated and enigmatic process, as any of us who are living and experiencing it know. Precipitated by little-understood changes in the workings of our cells and physiological systems, it proceeds in stuttering fits and starts, affecting some people and body parts earlier or more noticeably than others…Please click here to read more…