I don't think it's just me, it seems a lot of older people prefer more alone time compared to when they were younger?
Early humans were physically weak compared to predators, and their survival depended on banding together for protection, foraging, and hunting. Group living enabled the sharing of resources and collective care of children, increasing overall fitness.
Human brains evolved to be unusually large, which anthropologists attribute to the need to navigate complex social interactions and networks. Our "default mode" is social, meaning our brains are wired to prepare for social interaction, according to studies of brain activity.
Social connection strengthens the immune system, lowers the risk of chronic disease, and contributes to longer lifespans.
Human civilization, including language, technology, and science, developed specifically through cooperation and shared knowledge in groups. Humans have developed an innate, "vital warning signal"ālonelinessāthat acts like hunger, telling us to reconnect with others. Prolonged isolation is harmful, as it is linked to increased risks of heart disease, stroke, cognitive decline, dementia, and premature death. Lacking social connection increases risks of anxiety, depression, and low self-esteem.

It's good to have a few friends.