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Background: In the field of healthy aging, covid-19 is associated with a decrease in functional abilities of the body and serious diseases in the elderly. Regular assessment of intrinsic capacity (IC) factors provides an opportunity to better understand an individual's functional abilities and vulnerabilities in the context of a pandemic. In this study, while describing IC and post-acute COVID-19 syndrome (PACS), we also describe the relationship between these two variables to improve the health of the elderly in the epidemic situation. Methods: We searched PubMed, MEDLINE, Scopus, and Web of Science for relevant peer-reviewed articles in English using the keywords Intrinsic Capacity, COVID-19, Post-COVID- 19 syndrome, Post-Covid-19 complications, long-Covid-19, elderly, and PACS until September 17, 2023. We have summarized the information for awareness about the IC, covid-19 and its long-term complications. Results: The aging global population is leading to a shift from disease-centered to function-centered healthcare. The WHO introduced IC, which combines physical and mental abilities. Early COVID-19 effects impact IC factors like vitality, locomotion, cognition, and psychology. Long-term COVID-19 complications, persisting for up to three months post-acute infection, can heighten vulnerability in older adults with reduced IC. Reduced IC may worsen COVID-19 severity by diminishing immune responses, increasing complications, and susceptibility. This could lead to more severe symptoms and accelerated aging. Pandemic-related reduced mobility and social isolation further harms IC components. Understanding this relationship is vital for tailored elderly care amidst COVID-19 challenges. Conclusion: The reduced IC, especially in the conditions of pandemic diseases such as the COVID-19, can seriously threaten the health of the elderly. Therefore, IC is suggested as a suitable index to determine the vulnerability of people, regardless of chronological age, especially in pandemic conditions. [ABSTRACT FROM AUTHOR]