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Decision‐making competence (DMC) is the ability to follow normative principles when making decisions. In a longitudinal analysis, we examine the robustness of DMC over time, as measured by two batteries of paper‐and‐pencil tasks. Participants completed the youth version (Y‐DMC) at age 19 and/or the adult version (A‐DMC) 11 years later at age 30, as part of a larger longitudinal study. Both measures are composed of tasks adapted from ones used in experimental studies of decision‐making skills. Results supported the robustness of these measures and the usefulness of the construct. Response patterns for Y‐DMC were similar to those observed with a smaller initial sample drawn from the same population. Response patterns for A‐DMC were similar to those observed with an earlier community sample. Y‐DMC and A‐DMC were significantly correlated, for participants who completed both measures, 11 …