Models of aging and emotion hypothesize age differences in emotion regulation-in frequency, use of strategies, and/or effectiveness-but research to date has been mixed. In the current experience sampling study, younger, middle-aged, and older adults ( = 149), were prompted 5 times a day for 10 days to report on both general strategies (e.g., situation selection, cognitive change) and specific tactics. For each of the 5 strategies proposed by Gross's process model, tactics included those that introduced/increased positive aspects, avoided/decreased negative, and engaged with negative. Consistent with socioemotional selectivity theory, older adults reported less contra-hedonic motivation than younger, but this did not necessarily translate into age differences in regulation frequency or strategy use. Across the sample, strong preferences emerged for strategies intervening early in the emotional process and for tactics that introduced/increased positive aspects; a pattern that was even stronger in older adults. Middle-aged people more often avoided and reduced negative situations, whereas younger adults more often (though rarely) sought out or exacerbated negative situations. Effectiveness varied across strategies and tactics, but age differences only emerged for situation selection and reducing negative aspects of the situation (both less effective for older than younger adults). This research highlights the importance of studying how emotion regulation strategies are implemented in real life situations and suggests that age differences in emotion regulation, when they do emerge, may be more a matter of degree than of type. (PsycINFO Database Record (c) 2019 APA, all rights reserved).