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Median age

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Median age  (MEDIAN age)


The mean age1 of a population is the average age of all its members, the median age2 is the age which divides it into two numerically equal groups. When the proportion of old people in a population increases, we speak of the ageing3 of the population. An increase in the proportion of young people may be called rejuvenation4 of the population. The term ageing used above should not be confused with the technique of ageing5 a population. This technique consists of applying certain ageing factors6 to particular age groups of the population, in order to compute the total number of survivors of that age group at a later date.
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