age vs historic period

age and historic period both are nouns.

Word	Noun	Adjective	Verb	Adverb
age	Yes	No	Yes	No
historic period	Yes	No	No	No

As nouns, age and historic period are synonyms defined as:

age and historic period: an era of history having some distinctive feature

age (noun)	historic period (noun)
how long something has existed	an era of history having some distinctive feature
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