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To systematically review articles that reported the impacts of social isolation on the physical and mental health of healthy older adults during the coronavirus disease 2019 (Covid-19) quarantine. Electronic search was performed in PubMed, EMBASE, Web of Science, Scopus, and BIREME databases. It included cohort and cross-sectional studies published between January 2020 and January 2022 which evaluated the impacts of social isolation on the physical and mental health of older adults during quarantine. The study was registered in PROSPERO (CRD42021269720). Out of 8,505 studies identified, 17 met the inclusion criteria, with moderate to excellent quality. The majority of the older population perceived changes in their physical and mental health. Impacts differed in cohorts according to sex, age group, income, social participation, exercising before and during confinement, and living alone or with other people. The long period of social isolation dictated by the COVID-19 pandemic caused changes in most older adults', reducing levels of physical activity and/or generating depression, anxiety, fear, and mood problems. Follow-up studies are necessary to observe the evolution of these impacts. Public policies must be developed to promote the emotional and physical health of the older adult population in the post-pandemic period. [ABSTRACT FROM AUTHOR]