I am 25. Two years and one month ago I created a company called Pixelmatters (http://pixelmatters.com).
I basically did everything more or less the way you described. Which is something absolutely hard to do. As a result, in Aug 2014 we were 2 but today, as I write this, we are 14 and growing.
Company is profitable, has no VC money and is fully self-funded (initially, by my computer and...a decent internet connection).