Here's something I learned: It takes years--several years--to come close to mastering anything of sufficient complexity to be worth mastering. That is just not possible when you're young. We've all had to deal with that.
"I fear not the man who has practiced 10,000 kicks once. But I fear the man who has practiced one kick 10,000 times."
Be water, my friend.
Magnus Carlsen [1] became the highest rated chess player in the world at 19. This means that either it is possible to master very complex subjects while young, or chess is not very complex.
I don't understand why people, including the author, are completely disregarding experience here. I agree with the author's points that a young person, even a teen, could bring a lot to the table and has his own qualities, one of which is not great experience. But that doesn't disqualify him for any job, given a hunger to learn and a passion for his work. But to suggest that "the only difference is in music taste"--well, if you measure any one young person against any one older one, you could get that result, but I'd be hard pressed to expect the same when comparing you with yourself 10 years down.
I appreciate the lesson and understand that wisdom also comes with age. I don't dismiss that - in fact I realize and acknowledge that. That's why people have mentors, people with decades of life experience to learn from.
"Learn to distinguish between people who treat you well because they respect you, and people who treat you well because you're running half their business for an intern-salary."
Perhaps that is something you did not learn in your youth, but you should know that does not mean that those of similar youth age don't realize that. Personally, this was a point I exploited when I ran my business. Having interns that were years older than me doing work for me. Quite "amusing", as you point out, now that I think back...
Nevertheless, I think your advice is true. Lots of people out to take advantage of young people. This is not new, though and anyone with the level of experience in business having done work previously in youth years would know this.
The pattern that I've noticed is most people will speak similar to you. Those that don't and truly appreciate it were once young entrepreneurs themselves and experienced their levels of 'success' so they understand it. Though perhaps I just choose to surround myself with mentors of that particular quality.