An awful debility,
A lessened utility,
A loss of mobility
Is a strong possibility.
In all probability
I’ll lose my virility
And you your fertility
And desirability.
And this liability
Of total sterility
Will lead to hostility
And a sense of futility.
So let’s act with agility
While we still have facility,
For we’ll soon reach senility
And lose the ability.

Tom Lehrer (b. 1928) American mathematician, satirist, songwriter

“When You Are Old and Gray”