How many months old is a 12 year old?

Answer 1

1 yr = 12 months

→ 12 yr = 12 × 12 months = 144 months

So a 12 yr old is 144 months old on their 12th birthday. As they will keep saying they are 12 years old until their 13th birthday, they will be between 144 and 155 months old inclusive.

Answer 2

222