Are you going to throw in a free tube gear if we guessed it correctly?
Then here is my guess...you are, 21 [22 - your brother], 23, 24, 25, 26, 27, 28, 29, 30, 31, 32...45?
Just pick one of those then I am the winner.
My brother is 22 if that helps in the age guessing.
Anyone care to venture a guess on age? Be nice.