• Data reference period
• Place of residence at the Census moment (Series 1864 - 2021)

• PLACE OF USUAL RESIDENCE:  Living quarter that is the residence of at least one household for most of the year or to which the household has transferred all or most of its belongings.
• PLACE OF USUAL RESIDENCE:  Place in which a person normally spends the daily period of rest (regardless of temporary absences for purposes of leisure, holiday, visits to friends and relatives, business, medical treatment, or others) and where the person lives or intends to live for the most part of the year, taking the last 12 months as reference.
• AGEING INDEX:  The ratio of the number of elderly persons of an age when they are generally economically inactive (aged 65 and over) to the number of young persons (from 0 to 14).
• RESIDENT POPULATION:  Set of persons who, regardless of being present or absent in a given housing unit at the moment of observation, have lived in the place of their usual residence for a continuous period of 12 months prior to the moment of observation, or have arrived to the place of their usual residence during the period of 12 months prior to the moment of observation, with the purpose of living there for a year, at least.
• REFERENCE PERIOD:  Period to which the information refers and which may be a specific day or a time interval (month, fiscal year, calendar year, among others).

AR=[(P(65, +)/ P(0, 14)]*10^n

Measure unit (symbol)