I know there isn't much approval of astrology in this forum, but I just can't help it in this case.
According to Chinese Astrology (your animal sign based on the year you were born) a 6 year age gap puts a couple on opposite sides of the circle of conflict. As you can probably guess from the name this is likely to put you in conflict unless there is something else in your charts to balance it out.
To find your most compatible signs, age gaps with a multiple of 4 are ideal, you will have the greatest compatibility with these signs (triangles of compatibility).
I am going to add here that this is just the basics of figuring out compatibility based on astrology. And in the long run I have found a lot more truth in the circle of conflict than the triangles of compatibility.
'People are never perfect but love can be. People waste time looking for the perfect lover rather than creating the perfect love' - Princess Leigh-Cheri from Still Life With Woodpecker.