Feeling Suddenly Older? Scientists See Aging ‘Waves’ at 44 and 60

The oldest millennials have entered their 40s and are noticing the effects of aging. It might not be in their heads.

A growing body of research says the aging process might resemble rolling hills more than a slow and steady climb. Age-related changes—slowing metabolism, wrinkling skin—pile up over time but may crescendo at specific points in your life.