Survey of resident population aged 105 years and older
The survey of resident population aged 105 and over (defined in international classifications semi-supercentenarians population) collects information on surviving or deceased population over 105 years to provide a longitudinal database for that population group.
The data source, that is an administrative one, is the National Resident Population Register (ANPR). All municipalities that have at least one semi-supercentenarian among their residents are contacted by Istat in order to validate their actual presence (through the acquisition of a living existence certificate or, in case of death during the year, of a death certificate). In addition to this Istat collects other basic information about the semi-supercentenarian, such as date of birth, date of death, municipality of birth, marital status and citizenship.
People still alive are followed up every year until their death with the recording of the date of the event: as long as the individual remains alive, the validation process never stops. The data quality check for the database is also performed retrospectively in continuous mode. Every year Istat also proceeds to validate again backwards the data observed in the past, in order to ensure consistency in the extinction process of each individual generation. This activity can reveal differences between releases related to successive years of the database for the same generations involved, which is why it is always recommended to refer to the latest release.
Cohort: a group of persons who experience a certain event in a specified period of time.
Death: the end of all signs of life at any time after vital birth.
Resident Population: constituted in each Municipality (and similarly for other territorial divisions) of people with habitual residence in the Municipality itself. Persons temporarily residing in another Municipality or abroad, for the exercise of seasonal occupations or for reasons of limited duration, do not cease to belong to the resident population.
Semi-supercentenarians: people who reached and overpassed 105 years of age.
Supercentenarians: who reached and overpassed 110 years of age.
† : means that the cohort is extinct and there is no longer any individual born in the corresponding birth year.