my formerly very sweet cuddlebug tucker has changed quite a bit lately. he's more aggressive, scratching and biting when playing with me although he doesn't seem to be rougher with the other cats. he may be biting them harder, it's hard to tell but there hasn't been any howling or growling. he was the big brother and welcoming committee to my foster babies--never hissed or swatted, he just loved them immediattely and would cuddle up with them and keep them groomed. he's just not as affectionate although when he naps he still has to be right beside me. is this just typical teenage behavior? how long does it typically last? he was neutered a long time ago..