get on vs age

get on is not a noun while age is a noun.

Word	Noun	Adjective	Verb	Adverb
get on	No	No	Yes	No
age	Yes	No	Yes	No

As verbs, get on and age are synonyms defined as:

Other synonyms of get on include maturate, mature, senesce.

get on (noun)	age (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

get on (verb)	age (verb)
develop in a positive way	grow old or older
appear in a show, on T.V. or radio	begin to seem older; get older
grow old or older	make older
get up on the back of
grow late or (of time) elapse
get on board of (trains, buses, ships, aircraft, etc.)
have smooth relations