Has the demographic of "youth" gotten older, or younger with the emergence of social media?

• I feel like the demographic has grown in a sense of dependency upon parents and adults a lot more, but I also feel that with the exposure to so much knowledge about all of the things in the world (such as the BLM movement, politics, mass shootings, COVID-19, etc.) the demographic of youth may have shrunk because the "youth" being exposed to so many things may have brought out a lot more morbid concerns, stresses, and problems children are having to try and navigate or manage. I could be totally wrong, this is just how I see things from my perspective.

Definition: Youth culture refers to the societal norms of children, adolescents, and young adults

• today's societal norms I feel like would revolve around the likes of something such as Tiktok. The app that blew up over quarantine is definitely something that I feel creates modern "youth culture". Almost everything from the hottest celebrities, and fashion and makeup trends, to sabotaging political activities is found within this app.