I agree, I don't think guys should be expected to pay. I know lots of girls, myself included, who prefer paying for them self.
Opening doors etc. I think is nice, but I don't expect it or think it should be expected
I think two years makes less of a difference when you're out of high school.
A year twelve kid dating a year tener would not go down well. lol.
I say go for it as well :)