An old man limped into a doctors office and said, “Doctor, my left knee hurts so bad, I can hardly walk!”

The doctor, slowly eyed him from head to toe, and asked, “Sir, how old are you?”

The old man replied that he was 98.

The doctor, just sighed, and said to the old man, “Sir, just look at you, you’re 98 years of age! You’re nearly 100 years old, and you’re complaining that your left knee hurts! What do you expect?”

The old man looks at him and replies, “Well my right knee’s also 98, and that doesn’t hurt!”