Remaining

physically active as we grow older could help to keep our muscles and immune systems robust, according to two inspiring new studies of older recreational cyclists.

Together

the experiments add to growing evidence that some of our assumptions about aging may be outdated and we might have more control over the process than we think.

Aging

often seems inexorable and unvarying, and, in chronological terms, it is. The years mount at the same pace for each of us.

But

our bodies’ responses to the passage of time can differ. While most people become frail, a few remain spry.