Well, if you will give your Bar Mitzva bochur a PSP or GameBoy or iPod or Computer or cell-pone with full internet connection, then there is the same problem as with a iPad.
The iPad is basically a iPod Touch with a much bigger screen. And a better (much better) internet connection.
If you want to give your 13 year old male cousin a “toy” where he can see and watch anything that he wants, then go ahead!