Dependency Ratio: The ratio between the economically dependent (young children and elderly) portion of the population compared to the working-age portion.
Ageing Population: A demographic structure characterized by an increasing proportion of older adults relative to younger age groups due to declining birth rates and increased life expectancy.
Youth Unemployment: Refers specifically to the percentage or number of unemployed individuals within the youth age group (usually 15-24 years old) who are actively seeking employment but cannot find jobs.