overaged vs superannuated

overaged and superannuated both are adjectives.

Word	Noun	Adjective	Verb	Adverb
overaged	No	Yes	No	No
superannuated	No	Yes	No	No

As adjectives, overaged and superannuated are synonyms defined as:

Other synonyms of overaged include over-the-hill, overage.

overaged (adjective)	superannuated (adjective)
too old to be useful	old; no longer valid or fashionable
	too old to be useful