The positive association between intrinsic, as opposed to extrinsic, goal importance and Subjective Well-Being (SWB) is well-documented. However, less is known whether these associations are consistent across age groups and when simultaneously considering personality traits. Structural equation models conducted with young, middle-aged, and older adults indicated that neuroticism was negatively related to SWB across age groups, while extraversion and intrinsic goal importance held age-differential associations: Extraversion was related to SWB in the two younger age groups, whereas in older adults only an indirect effect emerged via intrinsic goal importance. Intrinsic goal importance was related to SWB among young and older adults but not among middle-aged adults. These results underscore the importance of age-differential associations in determinants of SWB.