"demographic ageing" . "results" . "ageing of the population" . . "aging demographies" . "aging" . "population becomes older" . "Population ageing" . "aging and shrinking population" . . "demographic aspects" . . "population" . "Population aging" . "population ageing" . "aging rapidly" . "\\\"mass aging\\\"" . "population is aging" . "aged" . "shrinking and aging" . "population aging" . "aging society" . "greying population" . "demographic shift" . "more people live to an old age" . "ageing" . "aging phase" . "Age" . "population of a species" . . "aging population" . . "young" . "population aged" . "aging populations" . "Aging Society" . . "Population ageing" . . "Aging society" . "longevity" . "older" . "ageing population" . "Aging populations" . .