out-of-date vs superannuated

out-of-date and superannuated both are adjectives.

Word	Noun	Adjective	Verb	Adverb
out-of-date	No	Yes	No	No
superannuated	No	Yes	No	No

As adjectives, out-of-date and superannuated are synonyms defined as:

Other synonyms of out-of-date include obsolete, outdated.

out-of-date (adjective)	superannuated (adjective)
old; no longer valid or fashionable	old; no longer valid or fashionable
	too old to be useful