1 You’re a baby until you are one
year old.
2 You’re a toddler from the age
of one to two .
3 I think you’re a child until you
are three years old.
4 You’re a teenager from the age
of 13 to 19 .
5 I think you become an adult
when you are 18 (21) years
old.
6 In my country, you become
a pensioner when you are 55 years old -for women, and when you are 60 years old - for men.