HOW OLD AM I?

A man decided to have a face-lift for his birth remembrance day. He spends $5,000 and feels really good about the results. On his way home, he stops at a newsstand and buys a paper.

Before leaving, he says to the sales clerk, " I hope you don't mind me asking, but how old do you think I am?". About thirty-five was the reply.
"I'm actually forty-seven", the man says, feeling really happy. After that, he goes into McDonalds for lunch and asks the clerk the same question. The reply is, "oh, you look about twenty nine".
Later, while standing at a bus stop, he asks an old woman the same question. She replies, " I am eight-five years old and my eyesight is going but when I was young, there was a sure way of telling a man's age. If I put my hand down your pants and play with your balls for ten minutes, I will be able to tell you your exact age".
As there was no one around, the man thinks, what a hell and lets her slip her hand down his pants.
Ten minutes later, the old woman says, "okay, it's done. You are forty-seven". Stunned, the man says, that was brilliant. How did you do that? ". The old woman replies," I was behind you at McDonalds.