He is old enough/big enough for supers, start slow. Smaller, younger dragons and babies however, shouldn't be fed large supers because, until they reach 16 inches, they have a slight bend in their intestinal tract, and shell particles/debris can get stuck there, causing blockage or impaction. So, go ahead and give your beardie some supers, they love them and he/she is big enough, just start slow, and I wouldn't use them as a daily staple, a few times a week is best.