Well, I'm 19 and my gf is 16. Both our parents know about the relationship, and totally approve of it. From the discussions I've had with her regarding this topic, she says that some girls actually prefer guys who are a few years older than them. There are a few reasons for this: Firstly, they tend to be a bit maturer than guys who are younger (I'm talking about guys under 18 here). There's also the whole protection thing; older guys tend to portray a more protective and manly image, which some girls seek in guys. However, this also means that this age gap may cause problems with the girl, if she's younger, as the sense of humour may differ. But I have, so far, not experienced any problems regarding this with my gf, and we've been going out for 18 months now.