I'm wondering whether "behave" can be used as a noun in a sentence?
behaves of young generations or behaviors of young generations
Hi, and welcome to English Forums.

No, you can't use "behave" as a noun.
I'd also consider whether "behavior" in the uncountable sense might be better: The behavior of ...

It sounds odd and unidiomatic to say 'young generations'.

We commonly use the phrase 'the younger generation', meaning young people today.

eg The younger generation does not understand the need to be polite.