Looking back was when you were happiest?

Researchers found that people with personality traits that allow them to be nostalgic about the past have higher life satisfaction than those who exaggerate or mull over their failures 

Extroverted people had the best ability to do this whereas those with neurotic tendencies were the worst. (Is this really new??) The study, published in the journal Personality and Individual Differences, suggests that outlook rather than experience and fortune has a strong influence on overall happiness.(As any decent therapist knows.)

It also suggests that by changing certain traits, rather than a whole personality, individuals could greatly improve their happiness levels. More... The Telegraph.