Thank you all a lot for all the replies, honestly I did not expect that many. And the reason i do not know his age is that my dad was the one who bought him and Im bad at calculations.
Sorry for being quite dumb but english isnt my native language so a little hard for me to understand. So when Im playing with him and he bites my hand or pants during a game of fetch do i just stand up and leave? I also read that I should turn my head away and look up but dont move. Again thank youall for your replies.