This is the 244th most frequent Persian word.
جوان
Young.
Here, 'جوان' describes a man, emphasizing his youthful age.
او یک مرد جوان است.
He is a young man.
In this sentence, 'جوان' is used as an adjective to refer to the speaker's earlier stage of life.
من وقتی جوان بودم، ورزش زیاد میکردم.
When I was young, I used to exercise a lot.
The term 'جوانان' is the plural form of 'جوان' and refers to the demographic group of youths.