It's because they're young. Girls can also be immature at the age as well. I think it really depends on who you hang around that will determine how fast one will mature. But since they're kids, they have plenty of time to grow up.
well, they can be tv reviewers who write reviews for tv.
Most 15 year-old boys are fertile.
There are not many girls that dig or like 13 year old boys. They may like the boys as friends only.
they are appropriate for 9 year old boys
Yes, it should be hyphenated like so: sixteen-year-old boys.
No, girls are intrinsically cooler than boys.
Because Boys are mean.
You don't.
no there are no 13 thirteen year old boys at this moment mostly you'd find the 15 years old or over.
girls
BEAUTY
they shouldn't.