I did my first paid programming job with 16 while I was in school. The application, a special CAD editor, is still in productive use after nearly 14 years and many enhancements. After that I always did some paid programming work besides school and university, just to get practice and money of course. Now I work nearly five years as a software engineer in a fulltime job.
So what do you count as programming expirence? All 14 years? According to Joel, only the five years in my fulltime job will be counted. Although I think I have more experience than someone that started creating software for productive use after she got her degree.