This is the 2142nd most frequent Dutch word.
jong
"Jong" means "young."
Here, 'jong' is a noun and refers to a young offspring, typically of an animal.
De ouders zorgen goed voor hun jong.
The parents take good care of their young one.
In this sentence, 'jong' is an adjective and describes the age of the person.
Hij is nog erg jong en leert snel.
He is still very young and learns quickly.
Here, 'jong' is part of an informal usage, within a phrase that can vary in meaning based on regional or colloquial expressions.