I wonder who the youngest on http://news.ycombinator.com/leaders (top 100) is. I see a few people I recognize as late-20s, at least, but most in 30s, and plenty in 40s-60s range
I doubt they'd admit it. From bitter experience, you can be as respected as you like in a community like this, but the moment you reveal you're 14, everyone will stop listening to you.