Hi Mataya,
It may be best to get to know this junior better first.
This way, you will be able to determine whether he is genuinely interested in you or just trying to date you because he feels that he can take advantage of your inexperience.
Being that he is a junior, he most likely has more dating experience than you do.
Hence, it would be best to take the time to get to know him better.
If, in time, he has shown you that his intentions are sincere, then you can consider dating him if you so choose.
Though he is older, it is only by a couple of years.
That isn’t much.
As long as you feel comfortable, you can date him if you so choose.
However, it should be because you truly want to, not because he is pressuring you to do so.