How old is my kitten?

Hello!

I just adopted a Maine Coon/Bengal mix, her estimated age is was 8 months old and she weighs just over 4 lbs. However, I'm wondering if she may be younger. My reason for thinking this is that I believe she's been teething, she constantly chews on my fingers and toes (is this teething? Let me know if it's not).

I read that Main Coons typically have all their adult teeth by 8 months. Is she still teething, if yes, does that mean she's younger that 8 months?

Thank you!

MC's are slow developers due to not been fully grown until they are four years, yes in a domestic / smaller breed cat you would expect a set of adult dentition that is not so with a MC & can be around a year, give or take a bit.....xxx