The whole duration of a being, whether human, animal, plant, or other kind, being alive.
The number of full years, months, days, hours, etc., that someone, or something, has been alive.
One of the stages of life.
The time of life at which some particular power or capacity is understood to become vested.
A particular period of time in history, as distinguished from others.
A great period in the history of the Earth.
One of the twelve divisions of a Great Year, equal to roughly 2000 years and goverened by one of the zodiacal signs; a Platonic month.
A period of one hundred years; a century.
The people who live during a particular period.
A generation.
A long time.
The shortest geochronologic unit, being a period of thousands to millions of years; a subdivision of an epoch (or sometimes a subepoch).
The right of the player to the left of the dealer to pass the first round in betting, and then to come in last or stay out; also, the player holding this position; the eldest hand.
That part of the duration of a being or a thing which is between its beginning and any given time; specifically the size of that part.
Mature age; especially, the time of life at which one attains full personal rights and capacities.
An advanced period of life; the latter part of life; the state of being old, old age, senility; seniority.

To grow aged; to become old; to show marks of age.
(informal) To be viewed or turn out in some way after a certain time has passed.
To cause to grow old; to impart the characteristics of age to.
To postpone an action that would extinguish something, as a debt.
To categorize by age.
To indicate that a person has been alive for a certain period of time, especially a long one.