Can you take a 20 year old to prom?

Genge- In many schools people that could attend prom have to be enrolled in the 9th grade or older, but can not be any older than 20. Many students appeal to go to prom, which is a formal dance held by a high school at the end of the school year, typically for students in their junior or senior year.

Is it weird for a 13 year old to date a 15 year old?

If dating includes sex (or any form of sexual activity) then the answer is NO - and parental approval is irrelevant. If you are under 16 then you may not lawfully engage in any sexual activity (not just intercourse) with anyone.

What is 11th grade called?

These same terms apply in the same way to the four years of a standard high school: 9th grade is freshman year, 10th grade sophomore year, 11th grade junior year, and 12th grade senior year.