I hibernated a bunch of juvies this year for the first time. They are all 3 years old, and 4 years old. One did not gain enough weight and I kept him inside. I have not weighed him, but he only comes out once a week when I take him out, soak him, and try to feed him. Yesterday was the first time he ate in over a month, and it was only 1 small red wiggler worm. Eventually he will eat, so I'm not worried. You have to do what you think is right for him, but if he were mine, I would keep soaking and trying to feed him, and not hibernate him.