Original post: https://www.artofmanliness.com/people/social-skills/the-importance-of-developing-and-maintaining-your-social-fitness/ Brett & Kate McKay • May 28, 2024 • Last updated: June 3, 2024 Started in 1938, the Harvard Study of Adult Development represents the longest longitudinal study on happiness ever conducted. It set out to follow a group of men through every stage of their lives, from youth to old...