I'm not too sure of his age. I've had him for a little over a year. His shell is about 8-9 inches long. He's in a 300 gallon rubbermaid stock tank with a ehiem pump that has a little pre-sponge-filter built into it and it's connected to an extrenal pond filter with ammochips and a sponge and stuff, I can't remember the brand off hand. He seems to be liking it in there.