I wonder how much variation there is between different cultures. I don't have a lot of context to go off of myself, but speaking to some of my Indian friends, it seems more prevalent in their culture to stay with your parents until you're married rather than running off while you're still single.
Although this is genuinely a positive article about young people, I feel that pulling conclusions about all 18 to 29-year-olds is painting with a broad stroke.
