This study will examine which impact lockdown strategies intending to prevent the spread of COVID-19 had on people with cognitive impairment and dementia. Comprehensive data from two large health studies in Norway, conducted before and after the COVID-19 outbreak, will be linked with health register data on the use of health care services and medication. Further, it will be conducted a survey addressing questions on social isolation and use of communicative technology, from March 2020 to January 2021. The knowledge gained from this study can improve the health care system's ability to respond more adequately to pandemics and other unforeseen events, so that the negative consequences for older adults with dementia and cognitive impairment can be reduced.