A grocer once had a daughter born to him. One day a friend of his made a match for his baby girl, and told him the future husband was only one year older than she was.

The grocer discussed this marriage in private with his wife. "Our daughter is just one, the boy's age is the double of hers; when she is twenty and gets married, her husband will be forty," he said. "How do we have the heart to marry off our daughter to such an old husband?"

His wife smiled and said, "You're really dumb. Our daughter is now one year old, in one years time she'll be the same age as the boy, now won't she?