Boxers or Briefs?

One day some guys were doing a survey between "boxers" or "briefs".They went to a 25 year old man and said "boxers" or "briefs"? Hesaid briefs.They went to a 40 year old man and said "boxers" or "briefs"? Hesaid boxers.Then they went up to a 80 year old man and said "boxers" or"briefs"? And the old man replied - "depends?"