Young men are apt to think themselves wise enough, as drunken men are apt to think themselves sober enough.

 from Knowledge of the World

Philip Dormer Stanhope

Human life is as evanescent as the morning dew or a flash of lightening.

 Samuel Butler

 はかない

You cannot escape the responsibility of tomorrow by evading it today.

 Abraham Lincoln

You're never too old to learn.

Learn as if you were to live forever. 

Sixty is the new forty.

Life begins at forty.