So my little sister is 14 she"ll be 15 in a couple months and she has gone to the movies with a boy who turned 16 a couple days ago...... And ive met the boy and hes a very nice kid... I personally never dated in high school...IIN for her to be going on dates with this boy at her age?

Get the gun ready!
But didn't become sexually active until I was 16.
I am sure she is sensible. It's good to get some dating experience when you are a teen before you get into those big, heart breaking, serious relationships when you get older.
Or are you just a pointless comment maker who gives no advice to the OP at all.