age vs modify

age is a noun but modify is not a noun.

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

As verbs, modify is a hypernym of age; that is, modify is a word with a broader meaning than age:

Other hypernyms of age include alter, change.

age (noun)	modify (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)	modify (verb)
grow old or older	make less severe or harsh or extreme
begin to seem older; get older	add a modifier to a constituent
make older	cause to change; make different; cause a transformation