Regional elderly population is the regional population of 65 years of age and over. Regional working age population is the regional population between 15 and 64 years of age. The elderly dependency rate is defined as the ration between the elderly population and the working age population.
Data on internal migration refer to yearly flows of population from one TL3 region to another TL3 region (regional migration). Outflows are represented as the number of persons who left the region the previous year to reside in another region of the country, while inflows are represented as the number of new residents in the region coming from another region of the country.
Net migration flow
The net migration flow is defined as the difference between inflows and outflows in a region. A negative net migration flow means that more migrants left the region than entered it.
Regions in OECD Member Countries have been classified according to two territorial levels (TL). The higher level (Territorial Level 2) consists of about 363 larger regions while the lower level (Territorial Level 3) is composed of 1 802 smaller regions. This classification - which, for European countries, is largely consistent with the Eurostat classification - facilitates greater comparability of regions at the same territorial level. The differences with the Eurostat NUTS classification concern Belgium, Greece and the Netherlands where the NUTS 2 level correspond to the OECD TL3 and Germany where the NUTS1 corresponds to the OECD TL2 and the OECD TL3 corresponds to 97 spatial planning regions (Groups of Kreise). For the United Kingdom the Eurostat NUTS1 corresponds to the OECD TL2.
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