ageless vs unending

ageless and unending both are adjectives.

Word	Noun	Adjective	Verb	Adverb
ageless	No	Yes	No	No
unending	No	Yes	No	No

As adjectives, ageless and unending are synonyms defined as:

Other synonyms of ageless include aeonian, eonian, eternal, everlasting, perpetual, unceasing.

ageless (adjective)	unending (adjective)
continuing forever or indefinitely	continuing forever or indefinitely