Why is my 1 year old bearded dragon only 11 inch?

Do you have a UVB light, he might have MBD if you don't otherwise he's just small

15-20 crickets a day is NOT enough! They should get as many crickets as he can eat in 5 minutes, which usually is about 40-60. But, he also might be a rankins dragon, which look pretty much the same as beardies but grow smaller, and usually don't have the yellow coloring. They require pretty much the same Care as bearded dragons but you can google search 'rankins dragon care' to get more rankin dragon care info., you should, also, like another person said, check for metabolic bone disease. Which happens when your dragon doesn't have a UVB light. And you can tell if your dragon has it by looking for deformities, (like, for example, a kink in you dragons tail... Etc). And, can your dragon walk normally? Because dragons w/ serious MBD don't really have good muscles, so they can

T really walk well. But also, he may, as another person said, just be small. my 10 month old beardies are 11" too, but the ends of their tails were nipped off by other beardies when they were babies so w/ tails theyd be like 15" so im not worried. same MAY go for your beardie... but im not sure.also, if your beardie seems healthy otherwise, then don't worry. Sorry for the length of this post.