He says "camera", but he clearly means "camera phone". And he's basing this on a study of 1500 adults who were first examined as children in the 1920s. So all of the study group are
at least in their 80s? Octogenarians aren't exactly known as major players in the social media scene.
I agree, those in the study group that are "thriving" probably are not photographing/videoing everything in their day and uploading it to social media (I'm willing to bet that the 50+% that are deceased don't, either). He would have done just as well to say that people who don't spend all day texting are more likely to "thrive". Given that social media and smartphones have only come along fairly recently, I'm not sure if you can draw
any connection between that and the 80-to-102 age group.
The more times I read the article, the more it appears to be a carefully worded, pseudo-scientific, thinly veiled "Darned kids with their newfangled cameras and sexting and bookfaces! Get off my lawn!" rant.