young vs unseasoned

young is a noun but unseasoned is not a noun.

Word	Noun	Adjective	Verb	Adverb
young	Yes	Yes	No	No
unseasoned	No	Yes	No	No

As adjectives, young and unseasoned are synonyms defined as:

Other synonyms of young include untested, untried.

young (noun)	unseasoned (noun)
any immature animal
young people collectively

young (adjective)	unseasoned (adjective)
(used of living things especially persons) in an early period of life or development or growth	not aged or processed
(of crops) harvested at an early stage of development; before complete maturity	not tried or tested by experience
not tried or tested by experience	without salt or seasoning
being in its early stage
suggestive of youth; vigorous and fresh