In 2019, we began conducting the current lifespan study of COGA, focused on two groups of prior COGA participants. The first consists of individuals from the Prospective Study who would range in age from 30 to 40 by 2023 (born between 1982 and 1993). This sample was chosen due to the lack of studies that have focused on alcohol use and problems in this particular midlife period. The second group is composed of participants who are currently (or will be by the end of 2023) age 50 or older (born before 1974). We are recruiting them now to increase understanding of alcohol use, problems, and disorder during the later life age period which has not been extensively studied. For both groups, the unified protocol includes the SSAGA interview, questionnaires, and in‐person laboratory‐based neuropsychological and neurophysiological assessments (see Table 1; and also details in the companion paper 3. Brain function). As has been true throughout COGA, the assessment procedures, in addition to being updated when appropriate, maintain continuity with prior evaluations.
