3 months, my cham is supposedly about 2 months (arrive Feb 28th, shipped at 4 weeks. 1 month plus time until now =2 months) and about the same size. I was concerned with growth because I rarely saw him eat and had a lot of escaped crickets, but I wipe lots of poop!
Scan the forums, great owners and people with a lot of helpful information, they probably saved my chams life! I'd suggest an introductory page with a fully filled out "how to ask for help" with pics, its always good to have around to link in any post you may have with questions or problems. Good luck to you and Rango!