My girlfriend is 5 years older than me and at first she had some issues about the age difference because she thought it might look weird to other people. But we have everything in common and are totally in love, and I think that's key.

I also think that the older you get the difference matters less. For example, a 33 year old with an 18 year old is a huge difference from a maturity point of view. But a 64 year old falling in love with a 79 year old isn't that different because both have gone through most of lifes experiences.

EDIT: I say we have everything in common which isn't literally true. We have all of the most important things in common and we teach each other about everything else keeping things interesting and exciting.