Seriously mate, there are worse age gaps than 7 years and a few threads about it at freeones.
If you like the girl it doesn't mean you are going to jump straight in to bed with her, you could become friends and take things slow.
I guess it depends on how mature this girl is, get to know her; girls mature quicker than quys anyway (so they say).
The main thing is the fact that you have considered the age gap:thumbsup:, I see 20 year old lads outside the school gates all the time waiting for 14 and 15 year old girls (and they are not their father's) and it drives me fucking crazy!!
Thank God I don't have kids yet as I would be neurotic, especially if I had a daughter.
I don't think a year is going to make much difference unless you are bothered about what others will think of you.