we have the same problem..also with a pastel about the same age too. Ive tried wiggling it in front of him and even offered him a live mouse, neither of which interested him... so now we are just waiting for him to get his appetite back. Our guy has not lost a noticeable amount of weight and hes still acting like his old self so for the moment im not too worried... I offer him a thawed mouse every week, and when he doesnt eat it, i put it back in the fridge..one of these days he will get it and im gonna be wiked happy