Not at all you are both viewed as adults and if you find some one that makes you happy age should not really matter.. age is only a number.. and can be viewed the same as a license plate has on a car.. it does not really mean a lot
The technically socially acceptable number is half your age + 7. For a 25 year old, it would be 19.5. 4 years is nothing, really. My parents are 9 years apart. My mom had me when she was 21, and my dad was 30. They got married when she was 19, and my dad was 28. That's not that uncommon.