I am not sure of Ozzy's age as he was bought from Petco. He is around 33" and I have had him since Dec. when I got him he was around 18-20".

I got the T11 48"x24"x18 with the belly heat and the two 8.5" cut outs on the top and sliding doors. I also had them drill a 1/2" hole on each end about 6" from the floor to slide my T-stat probes thru. Also at n/c they will engrave your name or the pet's name on the cage.
It's best to call them and tell them what you want, they are really nice folks who keep snakes themselves.