NICE! I have a RES (red ear slider) that I got about 3 years ago and he is huge, actually almost too big now (about the size of a 7'' frisbee), and a razorback Map he is just about 1 yrs old and only 3'' or less.
Where did you get yours from? How big is the tank? What is your filter set up?
Hate to break it to ya....anything bigger than a saucer, is a female. SHE will get about the size of an old LP record...within 5 years