I worked for a month at a place where the median age was 27. I'm 38. I felt tired by their wasted energy. They'd fight over tiny details, have arguments about things that don't matter. Hearing Devs with 3 years working experience tell me they can architect anything fatigued me. They talked about their crazy architecture like it was going to change it all. I left in a month, but I'd have left in a week if I didn't need the money.