Emma Nadler writing in The Washington Post:

The landmark Harvard Study of Adult Development suggests that close relationships are the most significant factor in personal well-being — yet it is not the number of relationships, but the quality of the connection that matters. Gaining one closer friend in 2024 may significantly boost your life satisfaction, as friendship is known to protect against stress and improve mental health. And one friend a year is manageable, yet could lead to three friends in three years and a handful of friends in five.