year dot vs age

year dot and age both are nouns.

Word	Noun	Adjective	Verb	Adverb
year dot	Yes	No	No	No
age	Yes	No	Yes	No

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

Other hypernyms of year dot include long time, years.

year dot (noun)	age (noun)
as long ago as anyone can remember	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