Age Unit

Those units of time that are routinely used to express the age of a person or thing. (NCI Thesaurus)

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Age Text

A textual representation of a chronological age.

Age Started

The age of a person at the start of a specific event.

Age Group

Subgroups of populations based on age.

Age at Time of Vaccination

The age of the subject at the time of the vaccination.

Age at Menopause

The age at which permanent cessation of menses occurs.

Age at Menarche

Age of first menstruation. A risk factor for breast cancer