its your call ultimatly. but if it was me, with a well managed place and the opportunity to let him grow, i would let him, atleast one more year maybe two and hope for more tine length (which is very possible). but in the end its your call, if he makes you happy like he is then take him! if he was to cross my path i would. but im in a high pressure area where a 3.5 yr old is OLD!!! ha good luck my man!