Study timeline and implications
MINOR, RECRUITMENT, RECRUITMENT
Recruitment and enrollment occurred between February 2018 and March 2020. We started recruitment for the younger cohort first, as we aimed to have completed data from the younger adults to analyze and report on while we recruited and ran the older adult cohort. Based on our experience with the younger cohort and initial testing with older adults, we made a few minor changes to the protocol for older adults (we cut out one stress task and slightly modified the Ultimatum Game task; see Methods for more information). Partway through data collection for younger adults, we added blood draws to the pre- and post-intervention visits. Thus, about half the younger and all the older adults were asked to provide blood samples. Older adult enrollment was cut short by the COVID pandemic.