Population ages 18 and above | Saint Kitts and Nevis – yearly data, chart and table

The estimated population 18 years of age or older in Saint Kitts and Nevis in mid-2025 amounted to 36 629 people, which is 0.53% more than in mid-2024, when it was  36 436 people. It has been growing in this country for already 34 years in a row. Over the entire period of data from the United Nations Department of Economic and Social Affairs since 1950, this indicator has increased in 1.39 times. The lowest 18+ years old population was recorded in 1970, when it was 20 236 people. The maximum number of people 18 years of age or older lived in Saint Kitts and Nevis in 2025 with a value of 36 629. The data is sourced from the UN report "World Population Prospects 2024", with the values for 2024 and 2025 being projections. Estimates of population by age describe the size of the population in the category. Population estimates are dependent on the demographic components of change that are fertility, mortality and migration.