Ok, fair, maybe I'm overreacting to it - i find headlines like that annoying.
If you have ever seen the early Seven Up movies (https://en.wikipedia.org/wiki/Up_(film_series) ) - the sheer mass of Baby Boom children all growing up together is incredible. No doubt peer influence was crucial for many of them.
But humans grow up in many situations, including remote farms, small villages full of old people, etc. Lack of cousins or same-age peers might be more common now, but it's been happening forever.
If you have ever seen the early Seven Up movies (https://en.wikipedia.org/wiki/Up_(film_series) ) - the sheer mass of Baby Boom children all growing up together is incredible. No doubt peer influence was crucial for many of them.
But humans grow up in many situations, including remote farms, small villages full of old people, etc. Lack of cousins or same-age peers might be more common now, but it's been happening forever.