Prostate

I am in the bathroom washing my hands. This old guy comes out of the stall. The old guy says, "Today is my birthday and  where are we going to lunch?"  

I say, "well, not sure." 

He says, "you aren't my friend. The gray hair and glasses fooled me." Then he says, " you don't have prostrate problems do you?" I said "no." Then jokingly, I say to him, "I am still blowing it out." He gives me the puzzled look. I say, "you know, sex." He laughs. "Well, he says, "I kept telling my wife that we had to keep doing it. She agreed but didn't help, got it anyway but had a lot of fun." "Well, I hope you aren't giving it up are you?" 

"I am 93, I think not."