Aww, how cute. I used to have two lil red eared sliders of my own. I got them like 3 years ago for christmas, but unfortunately one died a few months after I got them. But, one of them lived for 2.5 years. Unfortunately it had died this summmer in an accident, I was soooo sad. You can tell which ones are females from the males usually because males turn almost black and have really long claws, females stay green and I think are bigger than males, this is when they are mature adults I think at around 4 years old. In the old days, people thought the black turtles were a different type painted turtle but came to find out it was the male of the red eared sliders. Wow, sorry that was long.lol. Anyway they are really fun pets, best of luk!!