Youth is when you're allowed to stay up late on New Year's Eve. Middle age is when you're forced to.
Old age comes on suddenly, and not gradually as is thought.
old age, suddenly, gradually, thought
I don't believe one grows older. I think that what happens early on in life is that at a certain age one stands still and stagnates.
Aging is not lost youth but a new stage of opportunity and strength.
aging, new stage of opportunity, age