I have had my two beardies for 1 month today so i measured them just as i did the day i got them. Day one Yoshi measured 4.5'' and Kengo was 4 1/4 '', today when i measured Yoshi he had doubled in size and is now just under 9'' and is only 10 weeks old. Kengo was at 7.5'', however when i first got them i dumbly put them in the same cage and Yoshi ate 1'' of Kengo's tain and a toe off of each hind foot so she would be 8.5''. I don't know how big they are supposed to be at this age but i think that they are big.