The present thesis investigated the influence of different conceptual and methodological factors on age-related effects in prospective memory. In sum, the results of the three empirical studies presented in this dissertation confirm that prospective memory appears to be well-preserved in older adulthood. Furthermore, they suggest that everyday prospective memory performance is dependent on a variety of task-related, environment-related, and person-related factors, as well as on a combination of these factors. The present thesis integrates the theoretical and practical implications that emerge from these findings into the current model of prospective memory. In detail, it brings together how the ecological validity of the task and an individual’s social environment and resources may influence everyday prospective memory performance at different phases of remembering, as well as how these new factors appear to be functionally linked through conversational prospective memory.