The only major demographic change from when we were kids/young adults is the amount of twenty somethings still living with their parents. Mostly because they can not afford rent in the area they live in.
Here in southern NH a two bedroom apartment is over $2000/month. In Boston/Cambridge, MA it is over $3000.
In the suburbs of Boston a bedroom in a house/townhouse goes for $1000-1250 to share a place. My 24 year old son just moved in with a buddy to share a two bedroom townhouse. He is paying $1250. He was paying $1750 to rent a one bedroom apartment. He lives about an hour NW of Boston.
There’s a 21 year-old next door. Parents are prosperous. Kid graduated high school, not interested in college, no job, just sits at home 99% of the time. Has a nice car provided by parents but rarely drives it. Could save plenty of money by just getting a job but just sits there doing nothing.