Theory that happiness declines from young adulthood through middle age, then rises again around age 50, though this pattern is disrupted among today's young people.
"Scholars have long noted that happiness tends to follow a U-shape across the lifespan: Self-reported happiness declines gradually in young and middle adulthood, then turns upward later in life, starting around age 50. The Dartmouth University economist David G. Blanchflower—who, together with his co"