Psychology says people who reach their 40s and 50s feeling lonely aren't socially broken, they're often the ones who poured the most into careers, caregiving, and keeping others afloat, and simply ran out of room for themselves

Loneliness in one's 40s and 50s often results from years spent prioritizing careers and caregiving over unstructured friendship time. The economist David Blanchflower identified a U-shaped life satisfaction curve that dips in the late 40s. Psychologist John Cacioppo found loneliness stems from perceived isolation, not contact quantity.