lifetime vs age

lifetime and age both are nouns.

Word	Noun	Adjective	Verb	Adverb
lifetime	Yes	No	No	No
age	Yes	No	Yes	No

lifetime (noun)	age (noun)
the period during which something is functional (as between birth and death)	how long something has existed
	a time of life (usually defined in years) at which some particular qualification or power arises
	a late time of life
	an era of history having some distinctive feature
	a prolonged period of time