Greatness is the dream of youth realized in old age.

Forty is the old age of youth; fifty the youth of old age.

Everyone here should live to be a ripe old age and be healthy -- and keep coming to rehab because they need the money.

Medical advances have created a fourth age of humankind intermediate between middle and old age, and this is the new prime of life,

Our fMRI scanning reveals that middle age represents the transition between the patterns observed in youth to that found in old age. The seesaw imbalance in the two frontal lobe areas is not as significant as in older adults, but the functional changes are detectable by middle age.

That's the trouble with you young people. You think because you ain't been here long, you know everything. In my life I already forgot more than you ever know.