age vs rejuvenate

age is a noun but rejuvenate is not a noun.

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

age (noun)	rejuvenate (noun)
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

age (verb)	rejuvenate (verb)
grow old or older	become young again
begin to seem older; get older	make younger or more youthful
make older	develop youthful topographical features
	get or give new life or energy; return to life, regain energy, recuperate
	cause (a stream or river) to erode, as by an uplift of the land