The young man knows the rules, but the old man knows the exceptions.

A person is always startled when he hears himself seriously called an old man for the first time.

A young man is a theory, an old man is a fact.

The young man knows the rules but the old man knows the exceptions

A young man without ambition is an old man waiting to be.

It is bad for a young man to sin; but it is worse for an old man to sin.