yes it would be good for younger men to date girls who are a few years older. it doesnt really make a difference in the long run if they are only a bit older
but regarding the higher education for girls, they can get married while pursuing higher education. they dont have to wait until they are done with school to get married. i’ve seen a number of frum girls getting advanced degrees, who got married before even starting school. some even mothers of 1-2 children while in school.