Is He Really That Old?

The traveling salesman was passing through a small western town selling an elixir which he declared: "will make men live to a great age!" "Look at me," he shouted. "Hale and hearty, I'm over 300 years old." "Is he really as old as that?" a bystander ask the youthful assistant. "I can't say," replied the assistant. "I've only worked for him for just over a 100 years."