My guy historically has hated eating from forceps, but recently he is all about me using the forceps to place his food about 6 inches away from him so he can hunt without even moving from his hole. As soon as I put the cricket down and it makes it first move on the ground, he's on it. Gotta love the laziness.

But I digress...I think switching up the food is a good idea, but as Demeteraurion said, appetites can come and go with age. If he still acts healthy (which it sounds like he does) you should be fine! Just monitor him for any strange behavior if he contains to refuse to eat.