When does someone considered to be a teenager?

Answer 1

just born- 1 month newborn ................................................. 13-19 teenager

I

1 month- 2 year- baby ......................................................... 20-25 young adult

2 year-3 year infant ...................................................................25-55 adult

3 year- 5 year toddler ............................................................. 55-death senior

5 year -9 year kid/child I

9 year and ten year older kid I

11 year-12 year tween I

Answer 2

13.