Making comments or suggestions, to me, has nothing to do with age if they are genuinely concerned about the individual in question.
Of course the adult has the right to decide if those comments are appropriate, but there is no wrong in showing concern.
I'm happy my generation is opening up and offering help to anyone. Most of us are self-absorbed little bastards.
General concern is one thing, while being a pretentious douche is another.
If you're 12 and actually worried about someones well being, and trying to help them do better? Yeah, that's great!
If you're a Junior and feel the need to essentially belittle someone because of their problems, and act like you know what's best for them? Well, I'm just gonna assume you're some teen that thinks they know everything.
Maybe that makes me some "Self-righteous adult a-hole who has no respect for younger people," but what people don't know is I have a *team* of respectable kids who at least know the difference between trying to do good and sticking more wood in the fire.