The existing models of emotion regulation (ER) do not make any specific prediction about the differential effects of the same ER strategy among individuals of different ages. However, such assumption may not be necessarily true, given that older adults emphasise emotional goals greater than their younger counterparts. Using a daily diary approach, this study investigated whether the effects of cognitive reappraisal (CR) and expressive suppression (ES) on daily work‐related outcomes would vary by age when individuals were experiencing negative events at work. A total of 141 Chinese managerial employees (M
age = 42.40, SD = 9.16) completed the diary report for 15 consecutive workdays by recording their daily work experiences. The results of the multilevel analyses showed that age moderated the effects of ES on daily negative emotions, perceived work stress, and job satisfaction. More beneficial effects were observed among older workers than among younger workers. By contrast, the use of CR significantly lowered the levels of negative emotions and perceived work stress for both younger and older workers. These findings revealed the importance of considering the role of age in evaluating the effects of ES on work‐related outcomes, which provides important implications for future research and training programs in ER.