Author: Christine Rosenbloom, PhD, RDN, FAND

In many ways, age is just a number. Just look at Diana Nyad, aged 64, who in 2013 swam from Cuba to Key West, Florida, a 110-mile swim in the open ocean, after four failed attempts and whose historic swim was recently retold in the 2023 Netflix film Nyad.

Use it or lose it” is a common expression when it comes to aging—especially with regard to muscle mass. As…