You don't stop laughing because you grow older. You grow older because you stop laughing.

We don't stop laughing because we grow old; We grow old because we stop laughing

The older one gets the more one comes to resemble oneself.

Old age isn't so bad when you consider the alternative.

A comfortable old age is the reward of a well-spent youth. Instead of its bringing sad and melancholy prospects of decay, it would give us hopes of eternal youth in a better world.

We don't stop playing because we grow old; we grow old because we stop playing.