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1. 'Age' is one of the basic demographic variables used in population statistics. It is widely used in cross classification with other variables such as sex, marital status, occupation etc. It is most commonly used to differentiate populations in terms of the time elapsed (usually in complete years), generally from date of live birth to a point in time (e.g. date of a particular survey). Depending on the population, or topic of study, age may be measured in different 'time units' (e.g. infants under one year are measured in completed days, weeks and months and for persons over one year, in complete years).