I'm not very good at guessing age but I would guess maybe 4 to 5 months? I do want to let you know that you have the wrong uvb. You need a linear bulb that stretches across the entire enclosure. I recommend a reptisun t5 5.0. You can order them from petco.com or any other pet store but your best bet is online. If you do not get this he/she will get metabolic bone disease. Also, please get a picture of the back feet for tarsul spurs to tell the gender