The old believe everything, the middle-aged suspect everything, the young know everything.
Oscar WildeIn youth the days are short and the years are long. In old age the years are short and day's long.
Pope Paul VIThe excitement of learning separates youth from old age. As long as you're learning you're not old.
Rosalyn S. YalowFuturists get to a certain age and, as one does, they suddenly recognize their own mortality.
William Gibson