There is plenty of evidence supporting the idea that social connection leads to better health outcomes, and not just for older people. Modern living, especially in countries like the US, where many people move, live far away from each other, depend on social media to satisfy social impulses, and tend towards individualism and non-communal living, makes it harder to find meaningful social connection for many people, even urban dwellers, and can't be ruled out as a contributor to sub-par physical health and mental well-being.