>Older developers of HN, what are your experiences?

Over 40 here. The most difficult part is human interaction. Youngsters are obviously well behind their own hype and have their right to try. Mature folks like me take things with a grain of salt and acknowledge hard work is only a part of the picture, often not the most important. From a technical point of view, the headless chickens thing is also common but, again, youngsters have their right to believe they are Einstein, Feynman or Jobs.