The lady we got Thunder from was doing his original owner a temporary favor in trying to find a good home for the man's cat after he'd moved out of the country and couldn't take him with him. She (thought) he might be approximately 5-6 years old when we got him in Summer of 2005. He's definitely a very slow-moving, unplayful type cat. He slowly strolls around and lays around. You don't see him up any trees or playing with anything but he does seem content living with us.