forty is old age, fifty is youth of old age
None are so old as those who have outlived enthusiasm.
old as those who have outlived
Youth is when you're allowed to stay up late on New Year's Eve. Middle age is when you're forced to.
Age is not a particularly interesting subject. Anyone can get old. All you have to do is live long enough.
age, interesting, live long enough
Old age comes on suddenly, and not gradually as is thought.
old age, suddenly, gradually, thought
An archaeologist is the best husband a woman can have. The older she gets the more interested he is in her.