I always thought I'd be a grown up when I grew up

Go you! I think that's a great idea and love some of those kitty pics. I imagine you want it somewhere fairly discreet so you can flaunt it only at your discretion, but dont worry too much about older skin. I've seen people in their 70s who had full torso tats and they still looked good. Think it's a case of looking after your skin and not gaining or losing loads of weight which is what stretches it. But I like the idea of a domestic kitty climbing the leg from the ankle. It's so what they actually do!