To find the oldest person in a room:

  1. Line up all the people along one wall.
  2. Ask the first person to state his or her name and birthday, then write this information down on a piece of paper.
  3. For each successive person in line:
    1. Ask the person his or her name and birthday.
    2. If the stated birthday is earlier than the date written on the paper, cross out the old information and write down the name and birthday of this person.
  4. When you have reached the end of the line, the name and birthday of the oldest person will be written on the paper.