Guess my age?

A man decided to have a face lift for his  birthday. He spends $5,000 and  feels really good about the result. On his way home he stops at a  newsstand and buys a paper.  Before leaving he says to the salesclerk,
"I  hope you don't mind me asking, but how old  do you think I am?"

"About 35," was the reply.

"I'm actually 47," the man says, feeling really happy.

After that he goes into McDonalds for lunch, and asks the order taker the  same question, to which the reply is, "Oh you look about 29".

"I am  actually 47" This makes him feel really good.

While standing at the bus stop he asks an old woman the same question.

She replies, "I am  85 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 your exact age." 

As there was no  one around, the man thought what the hell and let  her slip her hand down  his pants.
Ten minutes later the old lady says, "OK,  it's done.  You are 47."

Stunned the man says, "That was brilliant. How did you do that?"

The old lady replies, "I was behind you in McDonalds.