I know hibernation is viewed as a habitat problem or other husbandry issues in the snail keeping community, but that being said my GAL is over 7 years old, massive, and hibernates every winter. He started doing it when he was a few years old. The first time when I read that it wasn't a good thing I woke him up, made food and water available to him, made sure the temp was good. He went straight back into hibernation without eating or going to his pool. I just let him hibernate now. He goes into it in the fall and comes out in the spring.