Muscle atrophy begins at ~50. Elite athletes who stay active grow old gracefully with few

Well SupportedIndividuals should maximize muscle mass gain before age 50 because muscle is difficult to retain later in life.

Partially SupportedIndividuals who were previously active but become inactive later in life experience a decline in fitness, weight, and health comparable to the general population.

Partially SupportedElite athletes who maintain physical activity throughout life experience graceful aging with fewer health issues.

Partially SupportedContinuous physical activity is essential for maintaining fitness, weight, and health as one ages.