Returns the 5-year age group ("<40", "40-44", ..., or "85+" years) to which an individual belongs.
continuous variable in years.
Factor indicating the 5-year age group.
Stavroula A. Chrysanthopoulou
# 5-year age group of an individual 21 years old:
# 5-year age group of an individual 77.5 years old:
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