First Year

How old are first and second year high school students in Japan?

I watched a Japanese movie with English subtitles and they mentioned something about a first year student and then a second year student. What does that mean? And is there such thing as a third and fourth year?

Please see this site.

http://www.tokyo-icc.jp/guide_eng/educ/01.html

You may say 1st grade, 2nd grade,
but in Japan 1st year, 2nd year.
That’s all

FIRST OF THE YEAR (EQUINOX) – SKRILLEX