At what age are people happiest?

Research on happiness across the lifespan (U-curve hypothesis) shows that happiness tends to be highest in early adulthood and later life (50+), with a dip during midlife. People over 50 generally report higher life satisfaction, emotional stability, and reduced stress compared to younger age groups. The 17-21 range involves significant life transitions, 29-46 involves peak career/family pressures, while 50+ often brings greater acceptance and stability.