I started out as a 13-year-old entrepreneur selling stuff on eBay (which was pretty new at the time). There was a loophole when they first opened where you could sign up under someone else's name and switch all of the records over to your name; that way you didn't have to be 18 to register.
I first grew to love the Internet as the only real meritocracy I experienced in life. No one knew I was 13. When I talked to people in person I would get a pat on the head and a "you'll do great some day," but the little eBay company I had started was taken very seriously. It's still around today, and it makes just over $2 million/year in net profit (not on eBay any more).
While the Internet is no longer as anonymous, and I am no longer with the aforementioned company, I believe product still speaks for itself. While it's true that investors may be looking for a dropout Stanford grad student, if you create something people love you can grow a company regardless of what anyone thinks about you as a person. Hell, I raised half a million dollars as an 18-year-old kid, not because I looked or acted like the quintessential entrepreneur, but because I could show numbers. If you can show someone, "Here's a black box where you put in $1 and $10 comes out," finding money isn't hard. Even if you're 18.
You don't know who I am from this comment (unless you stalk my bio and find me on Twitter). If you like it you'll upvote it. That's exactly (one of the many reasons) why I love the Internet.