group population group age group http://id.loc.gov/authorities/subjects/sh85002083 http://purl.bioontology.org/ontology/MESH/D009273 http://purl.obolibrary.org/obo/NCIT_C20587 https://homosaurus.org/terms/ageGroups HM721 Persons classified by age from birth (infant, newborn) to octogenarians and older (aged, 80 and over). Subgroups of populations based on age. age groups age