How old is my bearded dragon?

[lovemesomereptiles]

I purchased my bearded dragon from petsmart (stupid I know) and they told me he was 3 weeks old but he seemed WAYYY too big for 3 weeks, so if anyone has a guess about how old he is that would be great. Ive had him for a little over 2 months, so according to petsmart hes like 3 months now. He just seems a little large for 3 months. He's 12 inches long from head to end of tail and idk how much he weighs but here's some pictures

 

[AHBD]

Hi there....he's a handsome little guy. Petsmart was probably just guessing at his age, although some very fast growers could be 12" at 3 months, it's more likely that he is 4 [ my guess ] or 5 months. But not far off from 3 months anyway.