The aim of this study (N = 24,012) was to explore sex and age differences in a Taiwanese national sample. We found that women, married, middle-aged, belowaveragely and very-highly educated people reported higher happiness. In addition, sex interacted with marital status and education, while age interacted with marital status. Specifically, (1) men were worse off than women when widowed or divorced; (2) women with senior high school education were happier than men, but the trend reversed when they obtained graduate level education; and (3) married people were happier than their single counterparts during the suitable marrying age.Key words: SWB, sex differences, age differences, marital status, education, ChineseOver the centuries, philosophers and ordinary people have pondered what kind of life is worth living. Subjective well-being (SWB) thus reflects the full range of things that make life worth living. In this paper, I will adopt the customary terminologies used by most current scholars and researchers (c.f. Argyle, 2001;Diener, 1984) and use happiness interchangeably with SWB. Happiness is now defined as a predominance of positive over negative affect, and as satisfaction with life, consisting of people's general evaluations of their life, affective and cognitive.Psychologists have tried to identify correlates of SWB with concerted efforts for over four decades. While personality and attitudinal factors such as extraversion, neuroticism, optimism, internal control, and cultural individualism have been confirmed as important psycho-social correlates of happiness, major reviews almost uniformly concluded that "objective" external indicators such as demographical variables had rather small effects on SWB (Andrews & Withey, 1976;Argyle, 2001;Diener, Suh, Lucas, & Smith, 1999;Myers & Diener, 1995, 1996. For instance, basing on U.S. data, Myers and Diener (1996) claimed that "even distribution of happiness cuts across almost all demographic classifications of age, economic class, race and education level" (p. 54). Diener et al.'s (1999) subsequent review though did point out that in general "young, well-educated and well-paid" represent the personal profile of the happy person.One possible reason for such inconsistencies in the extant literature may be that demographic variables were seldom the foci of psychological research, which concerns itself more with psychological constructs such as personality, attitudes, and values. Thus,