I took a chance on a guy 5 years younger once, we'll be married ten years in May.
The only person it has ever bothered was me, but only when we were in our 20's. I am currently dating someone 7/8 years younger than me.
The only reason it works is because I can't tell he's younger.
We look about the same age, we act about the same age, and despite being in different stages of our life we mesh quite well.
I don't have a problem with it, and I'm sure plenty of women can look past it as well, but that's been my experience. In a weird way I find younger men can actually come off as MORE dominant because it's (technically, maybe?
I'm looking for a peer relationship, a partner, after all. There is no power play or submission to me being older than him.
Unless that was discussed up front, it would creep me out a bit.
Of course, he could have been older and still act like an immature baby. My current partner is aware of my troubled past and has never brought it up, not even once. Age really shouldn't matter, especially when you immediately click with someone.
As soon as you start putting importance on a person's age, it's almost like you're already setting yourself up to fail.