[Fr. age, L. aetas]

1. The time from birth to the present for a living individual measured in minutes, hours, days, months, or years.
2. A particular period of life (e.g., middle age or old age).
3. To grow old.
4. In psychology, the degree of development of an individual expressed in terms of the age of an average individual of comparable development or accomplishment.

Subentries:
achievement age
advanced maternal age
anatomical age
biological age
bone age
chronological age
conceptional age
age of consent
developmental age
emotional age
functional age
gestational age
menarcheal age
mental age
middle age
ovulation age
physiological age