How old?

An employer was taking interview of a prospective candidate.

Employer: “Have you ever worked anywhere else?”

Candidate: “Yes, sir.”

Employer: “For how long?”

Candidate: “Twenty years.”

Employer: “And how old are you?”

Candidate: “Twenty five years, sir.”

Employer: “How is it possible that you are all of twenty five and you have worked for twenty years?”

Candidate: “I was taking overtime into consideration, sir.”