Two old drunks are sitting in a bar when the first one says:

'Ya know, when I was thirty and got a hard-on, I couldn't bend it, even using both hands.

By the time I was forty, I could bend it about ten degrees if I tried really hard.

By the time I was fifty, I could bend it about twenty degrees, no problem.

I'm gonna be sixty next week, and now I can bend it in half with just one hand.'

'So,' says the second drunk, 'what's your point?'

'Well, I'm just wondering how much stronger I'm gonna get!'