> The percentage decline is also similar for the young and old; however, given how much time young people spend with friends, the absolute decline among Americans age 15 to 19 is staggering.
This "given how much time young people spend with friends" just sounds off to me, like it's supposed to be some sort of constant value, and that human nature, social dynamics, etc are fixed to historical quantities.
On the one hand, should young people spend more time with friends? Probably. But on the other hand, this sort of "facts of life" type of assertion comes off as manipulative