I'm well over 19, there is good stuff here, in fact pretty much all of it is good advice. If I was to add to it I would replace (8), which is somewhat superfic

I'm well over 19, there is good stuff here, in fact pretty much all of it is good advice. If I was to add to it I would replace (8), which is somewhat superficial, and suggest working on your people skills. People affect your life in every imaginable way, all the time, learn how to detect (and manage) the idiots and how to look after those you care about.