[jyl]

From the first link I posted, I see that by far the biggest rate of living with parents is among 18 to 24 year olds. Kids in college living in dormitories are counted as "living at home". Compared to 2007, significantly more 18 to 24 year olds are in college today. So I am wondering if the apparent increase in living at home rate among 18 to 24 year odds is partially just a reflection of more attending college.

I haven't looked into the rate among 25 to 31 year olds.

I agree that there are cultural differences. In Asian culture, it is also common for the young adult to live at home for some period. Getting kicked out of the nest at 18 is not the norm.