5 Fastest Aging Countries in the World

4. Spain

Demographic Old Age to Working Age Ratio: 77.2

Spain is a Southwestern European country. Spain has experienced one of the fastest demographic aging in the past 10 years, with the median age rising by 3.9 years between 2012 (40.8 years) and 2021 (44.7 years). The number of seniors in the country has increased by six million since 2023, reaching 9.68 million. This dramatic increase signifies Spain as a country with a growing elderly population.