The only phrase that pops into my head is:
What the bloody blue fuck does age have to do with it?
Two people are either good together, or they’re not.
And these implicitly judgmental questions of “What are you looking for?” are equally irrelevant. Why does everybody assume that every person on the planet is trying to lay out a Big Master Plan for their entire future at all times? And that every chance meeting of another person has to somehow advance the Master Plan, or it’s a Really Bad Thing? How about: Live life, love, and enjoy each other?
If you want to date her, date her. The hell with hangups and over-analysis and what-will-people-think and where-will-this-lead. Life isn’t a business plan, and friendship/dating/fun/sex/pleasure/love are not subject to an ROI analysis. All this “Oh, it just seems icky” and “Dude, how could you turn it down?” shit is just people projecting their own personal preconceptions and ingrained narrow mindedness onto a situation that is not theirs to judge or decide.
And the fact that you’re asking permission of the world at large (or this e-quivalent subset of it, at least), while plainly saying “But I wanna!” means that you have your own ingrained narrow preconceptions, on both sides of the fence, and that you’re trying to get the balance tipped, so you can get off the fence and do what you really want to do (which you’re not sure of yourself).
Forget age; it’s irrelevant. (Cue the dozens who will now come forth with allegedly logical reasons for why age is not only relevant but the primary consideration. As if logic were even remotely applicable in matters of human emotion, evolutionarily mandated psychological drives, sex, personal interaction and desire. Subtle hint: Logic and reasoned argument are not in the slightest way applicable here. You know that. Pay no attention to those who say otherwise.)
I’ve had several terrific friendships with women 15 or 20 years younger than I, with great fun, witty and interesting conversations, rewarding personal discoveries, and deeply felt attachment. I didn’t bed most of them. I’ve also had very happy times with women 15 or 20 years my senior and didn’t bed most of them, either. On both sides, age was irrelevant, to me and to them.
Should you date her? Who are any of us to say? You know the answer. All you have to do is get over your mental block and let the answer you have already chosen come forth.
Best of luck.