Lookup for FHIR R3 Age for use in FHIR R4

Source ElementUsageTarget
Age.idUseElementSameNameAge.id
Age.extensionUseElementSameNameAge.extension
Age.valueUseElementSameNameAge.value
Age.comparatorUseElementSameNameAge.comparator
Age.unitUseElementSameNameAge.unit
Age.systemUseElementSameNameAge.system
Age.codeUseElementSameNameAge.code