Ok, I believe I have a male beardie (not 100% sure) and I think he is around 5 months. (only 8 1/2 inch) He never head bobs but he arm waves occasionally. Do males arm wave? Or is it just females. I have no other beardies in the house, he just arm waves when ever he is hunting. So can you tell me if he is a male or female.
Actually, males armwave too, so that's not a sure way to help judging the sex of your beardie. Since he is 5 mo old now, try comparing his anatomy with this picture. Let us know if we can help. http://www.beardeddragon.org/articles/sexing/