Every now and again, someone emails me and asks for very general advice. ("How do I change the world?") With the caveat that I've only lived a fraction of one life, and am still trying to figure things out, here's the advice I'd give past me.

If you're 10–20: These are prime years!

If you're 20–30: I don't know yet. I plan to think about this when I'm 35-40.

If advice on this page helped you, I'd love to hear about it. And if you're reading this page, Pioneer and Emergent Ventures might be of interest. Alexey Guzey has some good suggestions and pointers, too.