Original data sources for Area Level Index of Age Diversity in the UK, 2002-2019

Lower layer Super Output Area population estimates (for England and Wales) https://www.ons.gov.uk/peoplepopulationandcommunity/populationandmigration/populationestimates/datasets/lowersuperoutputareamidyearpopulationestimates

Mid-year population estimates for 2011 Data Zones and other geographies from 2001 to 2021 (for Scotland) https://statistics.gov.scot/data/population-estimates-detailed-current-geographic-boundaries

Mid Year Population Estimates for Northern Ireland  https://www.nisra.gov.uk/publications/2020-mid-year-population-estimates-northern-ireland