The Case for an Older Woman: How Dating Preferences Change with Age
theblog.okcupid.com
theblog.okcupid.com
I met my wife on OKC, using a age selection range of +/- 10%. (I didn't expect to find anyone at all interesting more than a year older than me, and indeed did not.) She's a couple of years younger, but arguably more mature. It's awesome.
Beyond that, looks are (sadly) crucially important. Pick someone who's a careful match, or perhaps slightly less attractive. Missing on this is a recipe for misery.
Also, many older women are asexual. Beware, if it matters to you.