Abstract Background During COVID-19 pandemic, healthcare systems experienced unprecedented shock. Older adults were the most vulnerable group of Lithuanian society, facing distinctive health challenges and highest mortality rates. The aim of the study was to examine perceived inequalities and challenges in access to healthcare of Lithuanian population over 65 years old during COVID-19 pandemic. Methods Representative sample of Lithuanian population over 65 years old (1503 individuals) was involved in the anonymous questionnaire survey, performed in January, 2024. Results 22 % of respondents reported not using healthcare services during COVID-19 pandemics. Among them, 76% did not have any need for healthcare services, while 13.6% did not approach healthcare due to fear of getting infected by Covid-19, and the other 10.4% had various accessibility challenges. 15.8% reported frequent problems in registering with family doctors, and 20.0% - with the specialist appointment. There was a clear social gradient observed among those underserved: it was associated with educational level and place of residence. Those with lower education and living in smaller towns and rural areas reported more common healthcare accessibility problems. Higher education, income and better self-perceived health correlated with higher satisfaction with travel time reaching health care services and registering for the appointment (p < 0.05). Conclusions Health system resilience reflects the ability to continue service delivery in the face of extraordinary shocks. Limited health care accessibility and clear social gradient could increase vulnerability of older adults, which resulted in exceptionally high mortality rates during COVID-19 pandemics. Results of the survey will be used for further development of transformative capabilities of healthcare system, responding to public health disasters and protection of the vulnerable groups of the society. Key messages • Limited health care accessibility and clear social gradient could increase vulnerability of older adults, which resulted in exceptionally high mortality rates during COVID-19 pandemics. • Results of the survey will be used for further development of transformative capabilities of healthcare system, responding to public health disasters.