chronological age vs age

chronological age and age both are nouns.

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

As nouns, age is a hypernym of chronological age; that is, age is a word with a broader meaning than chronological age:

chronological age: age measured by the time (years and months) that something or someone has existed
age: how long something has existed

chronological age (noun)	age (noun)
age measured by the time (years and months) that something or someone has existed	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