[Skyline]

In my opinion it's not uncommon. In terms of how acceptable it is, again I would say that it's acceptable so long as both people are at the same level of maturity. I was dating a senior guy as a junior and if anything I feel like I was the more mature of us both, and I feel like our age difference didn't impact our relationship at all, except for the knowledge that he would be graduating soon so it felt a bit rushed for me. I think that what matters most in a relationship is the maturity of those involved and their experience and awareness in relationships, and although age can be a rough indicator of these things there is definitely a margin of error and flexibility.