Don't worry about it. What people might think of you as a couple is just one of many factors that go into deciding whether to pursue a specific relationship. A lot of the comments about "Oh, well, she will be mature and will teach you things in the bedroom! My fiance reminded me that we share the same cultural touch points. Ask her out if you are ok with dating an older woman.
Alot of my friends date younger guys and they have great relationships I don't think age is really an issue for most couples depends how bothered they are about others opinions.
People have already given your grief for describing yourself as a 26 year old boy and caring about the opinion of an anonymous bunch of dudes on OKCupid, so I'll spare you on that front. Of course this is fine. I am older than my husband by 6.