Tenshinhan & Chouzu

Longtime friends, Tenshinhan and Chouzu start out as enemies of Goku and company.  Trained by Kamesennin's rival Tsurusennin, to be assassins, they meet Goku and the others at their second Budokai.  At first, Chouzu tries to kill Kuririn, and Tien nearly kills Goku but is won over by his actions.  At this point, Tien is a little stronger than Goku.  These two are the first we see fly.   Shortly after the Budokai, they both help Goku against Piccolo Daimaou.  This is where Chouzu, Kuririn, and Kamesennin die the first time.  Later, they fight again at the next Tenkaichi Budokai.  Here we find Goku has surpassed Tien, in strength.   I don't think Toriyama-san ever said what their ages are, but I'm guessing they're about Yamcha's age.