There seem to be a lot more young developers than old developers. But, why? I can only assume that either, the number of developers is increasing (more and more young people entering the work force), or a lot of people stop being software engineers after 8 years. People usually work between the ages 22 and 65, so given a even distribution, if the industry isn't growing by leaps and bounds, the average work experience…
Students and younger devs need to ask more questions, so they have a more active presence. While an older dev may still need to ask questions, they can just google, and find the answer without needing to create an account.