My buns hated Timothy hay too! I got them at 3 and a half years and my friend who owned them before told me she was still feeding them alfalfa because they refused to eat the timothy. I decided I'd better try different grasses, since that was the advice I'd read on this board before. So I got them some meadow grass and they switched it up just fine. Then, when my other friend's roommate had to give up her bunny, she gave me a small bag of her leftover timothy hay, hoping I'd be able to use it. Surprise, surprise, after having eaten the meadow grass for about a month, bunnies didn't mind some timothy in their play box anymore.