15 - Started in high school selling home-made (non-drug) cookies, making $100 a week profit. 16 - Started a business selling cheap Chinese MP3s online, but it

15 - Started in high school selling home-made (non-drug) cookies, making $100 a week profit. 16 - Started a business selling cheap Chinese MP3s online, but it failed. 18 - Sang on the subway with a friend for $100 a day, 3 days a week. 19 - First SEO consulting job, made $400. 20 - Got job at a sustainable denim start-up as assistant director of marketing. I'm not sure if any of these count by HN standards, of course.