You know you are OLD when...

[summerpalm]

Now I feel old

[hellosailor]

Pishtah!

You're not old until the day you wake up and find rust stains on your pillowcase!

[David_Old_Jersey]

I think one of the first signs is when asked yer age, some thought is required........and you long ago stopped using fractions

[Sunspot Baby]

Now this is old:

An old man's friends decide to give him a surprise birthday gift, so they hire a beautiful hooker and send her to his door.

When he opens the door she says "I'm here to give you super sex for your birthday."

He says . . .

"I'll have the soup."