Age has nothing to do with it, but it does stick at the back of our minds, it up to you if you let it bother you. Mmy ex of 2 years was 18 and im 19, but my currnet girlfriend is 15.
It is a bit strange at first being with a younger person,(especially after being with older women in the past 23 and 25) but it isnt really bothering me, she very mature for her age, and i just dont care about other peoples opinions of us. Its going good so there we go.