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Dispositional mindfulness is associated with lower levels of perceived stress, with increased emotional regulation and cognitive control proposed as mechanisms underlying these stress-buffering effects of mindfulness. Within aging, these controlled processes represent paradoxically divergent trajectories such that older adults exhibit reduced cognitive control capacities, while emotional regulation abilities are well maintained, and at times enhanced. Our study seeks to examine the role of emotional regulation and cognitive control as possible mediators of the association between mindfulness and perceived stress. In addition, we examined age-related differences in the observed associations among mindfulness, stress, and controlled regulatory behavior. Fifty older adults and fifty young adults were recruited for the study and completed self-report measures assessing mindfulness disposition, perceived stress, and emotional regulation. In addition, computerized measures of cognitive control assessing working memory, inhibitory control, and set-shifting were also administered. We hypothesized a negative correlation between mindfulness disposition and perceived stress such that participants reporting higher levels of dispositional mindfulness would report lower stress. In addition, we hypothesized increased difficulties in emotion regulation and lower cognitive control to mediate this relationship. Corroborating previous literature, results revealed that mindfulness disposition and perceived stress were negatively correlated in both groups. However, emotion regulation, but not cognitive control, was found to mediate the relationship between mindfulness and perceived stress in both groups. Age group was not found to moderate the observed effects. Our findings reveal the role of enhanced emotional regulation abilities as a potential factor associated with the stress-reducing capacity of dispositional mindfulness.