I've been wondering about that for a few days now. I think the answer is "yes, I want all of your characters to be within a few years of one another. Say... 5?" I think I'd like it if your characters were all between the ages of, say, 16-20? Or 18-22? You are all 1st level and while its nuts to have as many Skills as each of you has at your age if you were human, well, you're not! =)BTW, is there an age range you are looking for?
In fact, I'm thinking 10 years ago, you were rescued together! That would take up the time for most martial art system learning time requirements, plus it would mean your characters would have spent roughly half of their lives or more together! I'd like it if everyone knew each other extremely well. It doesn't mean you always get along; it just means you grew up together under the same roof, training in martial arts and developing your Mutant Animal Powers while absorbing and practicing Skills.
If your characters are to be a team, then the more you have in common, the better. Age is part of that.
How does that strike everyone?