The paper focuses on demographic changes in the European Union and the Republic of Croatia as the observed EU member country. Demographic changes can be classified as either natural or migratory. Natural demographic changes deal with fluctuations in natural factors such as mortality rate, birth rate, median age in a country, and the like. Global technological advances have led to better health care and higher living standards, resulting in a longer expected lifespan and, consequently, aging of the population in the area under consideration. It has been observed that the population in industrialized countries is aging rapidly and young people start families later and less frequently, which leads to greater dependency of older people. Natural growth in the European Union has decreased significantly since its establishment, and although the decrease in natural growth in the Republic of Croatia is significantly smaller than in the EU, it is expected to soon reach the European average if the current trend of natural growth decline continues. Despite a decline in natural growth in the EU, the EU population continues to grow due to positive migration balance. The migration balance in the Republic of Croatia has been negative for years, and the country is losing more residents than it is gaining, which necessitates urgent government intervention. The Corona crisis began in 2020 and resulted in significant demographic changes, including increased mortality among the elderly and very old, decreased people-to-people contact, and, consequently, decline in marriage. Both the EU and the Republic of Croatia have experienced significant economic and social changes as a result of the Corona crisis.