Humans may possess some ability to regrow it. Doesn’t look like it will help that much for knees and hips, though. But you never know what they’ll find next. Fortunately, I’ve never had any joint problems, yet.
Ember is almost a year old now (how time flies) and he’s almost like a dog in his desire for affection. Ashe is a little more aloof, but she likes to be on my lap while I work.
Per requests in comments, here are some pics. These are the kittens on the stairs, a few days after we got them at Christmas. Ashe is on the left, and we didn’t know that Ember (who was smaller at the time) was a boy. [Bumped]