Arthur is 90 years old and has played golf every day since retiring 25 years ago. One day he arrives home looking downcast. "That's it!" he tells his wife. "I'm giving up golf. My eyesight has gotten so bad that once I've hit the ball I can't see where it goes." His wife sympathizes and makes him a cup of tea. As they sit down she says, "Why don't you take my brother with you and give it one more try."
"That's no good" sighs Arthur, "Your brother's 103. He can't help."
"He may be 103", says the wife, "but his eyesight is
perfect."
So the next day Arthur heads to the golf course with his brother-in-law. He tees up, takes a mighty swing and squints down the fairway. He turns to the brother-in-law. "Did you see the ball?"
"Of course I did!" replied the brother-in-law, "I have perfect eyesight".
"Where did it go?" asks Arthur.

"I don't remember."