I've been in two relationships with almost 20 year age gaps. And I know a lot of couples, both gay and straight, with similar gaps. The challenge is always about the maturity -- not in age, but in ability to navigate relationship issues, and communicate. In any relationship, you can have different interests, different experiences, come from different places and backgrounds... before age is even a factor. It's just one of those differences, something to be enjoyed, explored, and seen as an adventure, not as a hindrance.
There will always be some people who look at the age gap and have an issue with it... and they can fuck right off. Many of those same assholes will grow old, all the while leering at younger people and never realize that if they weren't such miserable judgmental assholes, they might find someone they're lusting after is into them.
I was once standing outside a bar in the Castro district in San Francisco. An older man (early 50s?) had just walked up and introduced himself to a much younger man (early 20s?). "You look younger than your profile picture." says the older man. The younger man responds, "You look older than yours... I guess we both win, daddy!" and off the marched into the bar.
Don't let the opinions of assholes determine what you seek. Go for it and you might both win.