noun The amount of time that some being has been alive, or that some thing has been in existence, as measured from its birth or origin until the present or until some other given reference point. (Often measured in number of years; alternatively in months, days, hours, etc.; see also the usage notes)
"What is the age of your oldest child?" — "He's ten." (ten years old)
noun The state of being old; the latter part of life.
Wisdom doesn't necessarily come with age, sometimes age just shows up all by itself.
noun Any particular stage of life.
the age of infancy
noun The time of life at which some particular power or capacity is understood to become vested.
the age of consent; the age of discretion
noun Maturity; especially, the time of life at which one attains full personal rights and capacities.
to come of age; she is now of age
noun A particular period of time in history, as distinguished from others.
the golden age of cinema; the first age of colonialism; a bygone age
noun The time or era in history when someone or something was alive or flourished.