Longitudinal data from the Panel Study of Income Dynamics (PSID; N = 2996) were used to test hypotheses about the link between well‐being and financial and social developmental resources. Results suggest that higher average family income from birth to age 18, and personal and professional mentoring received between 17 and 30, were positively associated with indicators of positive well‐being and negatively related to negative indicators of well‐being. Interactions between early life family income and mentoring during emerging adulthood were not significant predictors of any of the well‐being outcomes. In all cases, the magnitudes of the coefficients became larger when simultaneously accounting for early life income, emerging adulthood mentoring, and their interactions—suggesting that financial and social resources in earlier life are independently linked to later life well‐being. Findings highlight that mentoring received in emerging adulthood benefits downstream hedonic and eudemonic well‐being, regardless of financial resources.