FaunaClassifieds - Brumating???

I'm not entirely sure this where I should be putting this (I'm new to this forum),but I have a question for anyone willing to add their expertise.I have a bearded dragon named Tut whose almost six years old.Ive had him since he was a baby (I'm guessing about a month old),and in all that time he's never brumated during the winter.It was my understanding that some dragons do, and some don't,until about two weeks ago.It became unusually cold for a few days,and then he stopped eating.Hes refused food for the last week and a half (even strawberries,his favorite!),and then he's been sleeping since yesterday.From what I've read online this seems normal for a brumating beardie,but should I be worried that he's never done this before??