Age bubble

Age bubble - is a term used for the description of the phenomenon of the appearance of higher than expected number of long lived individuals considering the years of their birth in a particular country or region. In supercentenarian study, age bubbles have occurred in Germany among the population of supercentenarians born in 1893. In Belgium, there have been more verified supercentenarians born only between years 1899-1902 than all those born in the earlier years, making that period one of the most illustrative age bubbles.