You know you're old when :-
Your partner asks you to come upstairs and make love and you know you can't do both.
Your doctor tells you to slow down and not the Police.
You find yourself saying "ouch" before you bend down.
Your definition of "getting lucky " changes to mean "finding the car in the car park".
When you don't mind where your partner goes out to, so long as they don't ask you along too.