This was in my local paper on Saturday:
First, pick the number of times a week you like to have chocolate (more than once but less than 10). Double it, then add five. Multiply your answer by 50. If you haven't had your birthday this year, add 1754. If you have, add 1755. Now subtract the four-digit year in which you were born. You should have a three-digit answer. The first digit was your original number (how many times you want that chocolate a week). The next two numbers are your age!