Each new upgrade comes with new features most of which the majority of people will never use. All the options and buttons. Again it is overly complex. Am I dumb, I don't think so. Not necessarily, maybe they have different priorities and more time.
Adults have a lot of things to contend with, jobs, relationships, finances and domestic duties.
They often just do not want to spent hours doing things that can be done in five minutes. Priorities are also different. Being a teenager myself at the time I knew all the bands and who was who on the top 40. At the time I couldn't imagine not knowing these things. But now I too know very little about contemporary music.