Talkin' bout dudes here, but I'm 19 and I like guys who appear to be around 28 or so. That works out well for me because there are a lot of people who like barely-legal-looking guys. So while I'm not my own type, I'm a lot of people's type, and I'm okay with not being sexy to me as long as I'm sexy to a lot of people.
Of course, I don't really have a hard stopping point, age-wise. Does someone automatically become un-sexy once they were born before a certain date? Of course not, that's dumb.
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senorhousemouse