This study investigates how two sources of individual heterogeneitypersonality and genderimpact the wellbeingeffects of retirement. Using data on older men and women from the British Household Panel Survey and its continuation, Understanding Society, we estimate the causal effect of retirement on satisfaction with overall life and domains of life in the presence of personality characteristics. As retirement is often considered to be a choice and thus may be endogenous to individuallevelcharacteristics, we use the eligibility ages for basic state pension in the United Kingdom as instruments for retirement. We find that retirement increases leisure satisfaction of both males and females but not necessarily life satisfaction and income satisfaction. We further show that certain personality characteristics affect the wellbeing of female retirees. For males, however, personality does not seem to matter in how they cope with retirement.