I want to be a fireman

We went to a little Independence day celebration thing this morning and there were some firefighters there giving the kids a tour of their firetruck. This little boy jumped up in the seat and had the following conversation with a fireman:
boy: I sure wish I could be a firefighter and drive this truck!
ff: Well maybe you can someday when you get a little older.
boy: My birthday is in August! Then I will be older.
The fireman asked him how old he was and told him he'll have to have 13 more birthdays before he can drive the firetruck. The kid looked crushed.