Cooper is a serious Beardie expert,so it is always good advice,from him.
I would not want my boy to brumate before age of one year. I live in SD, where weather gets quire cold, and Dezi slows down during cooler climate changes. I make sure he is getting plenty of heat--mid seventy (degrees) at night, and a basking spot around 105. If he is hiding under a cool place, I remove that, to ensure he keeps warm. I also take him out to play, walk about, and get him moving. He likes to chase a cat toy that is basically a stick with feathers on one end, and also a little red "laser" light that I found in the cat toy department. Lots of hugs, tickles and brushing with a soft make up brush also keep him more alert,when he tries to brumate.
I do not allow my boy (age three years) to brumate; that is a personal decision, and there is plenty of info that is both for, and against it. My boy is quite healthy, so has not shown any signs of harm from lack of brumation. In the wild, they must brumate due to cold weather and lack of food available, but it can be a strain on their health, if they are in a weakened position, or do not have enough fat stores. It should not be a problem if they are in good health. I am selfish in that I want to interact with my boy every day, and do not want to be apart from his company during a long brumation. It is not dangerous to them, to keep them active and not allow brumation, so I would say it is a matter of personal choice.