"Ya know, when I was 25 and got a hard-on, I couldn't bend it with both hands.
By the time I was 50, I could bend it about 10 degrees if I tried real hard.
By the time I was 60 I could bend it 20 degrees, no problem.
I'm gonna be 80 next week, and I can bend it in half with just one hand."

"So, what's your point?"

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