Your option would be to go to a dental surgeon to have then put some braces on. They do have braces that you can't see.
I don't know what others think, but I think they are quiet fashionable, atleast at the time I had them on which was about 4-5 years ago when I was 14 or 15. I loved my braces. And my cousin got her braces done at 19 so I don't know what you are worried about.
I'm going through that same problem and i think it doent matter your age.
I am 18 years old and just resently closed my gap using www.gapinmyteeth.com. You wear what looks like a small rubber band around your front teeth. The band is streached out so it pulls on your teeth. I had a large gap and it closed after about a month.
I had 3 gaps between my front teeth and I used teeth makeover bands and they've closed up. My friend used them too, but when he leaves the bands off for a couple of weeks, the teeth start to gap again. I think it's worth it, though. I don't mind putting them back on at night to not have to spend thousands of dollars to get the gap fixed permanently. It's not even really permanent, the veneers come out in like 7 years anyway. anyway, the address is teethmakeover.com if you wanna go see 'em.. I like them better than teeth effect, teeth effect took -forever- to ship my bands
My son used these bands and then needed an operation to remove 2 bands that had gone up under his gums, restricting the blood and effecively killing the tooth root , it was very painfull and nobody knew what was happening for weeks, they thought it was just general gum issues, he is lucky to have kept his front teeth but 4 years later still has major probelms with his gums and needs another operation to remove some gum, as your gum doesn't regrow once damaged, he may lose his teeth, he is only 19years old. THESE BANDS ARE NOT SAFE. we did this through our orthodontist, but will be pursuing a complaint procedure.