Quote - How safe is Poser for a younger audience?

That you're asking the question suggests that you think that some aspect of Poser may be unsafe.
You haven't said what that aspect is, neither have you provided details of the social context which makes you think that.  

Quote - Am I overthinking this? am I disorting the whole thing? Opinions are most welcomed.

Without knowing the social context in which you're asking, there is no way to answer.  

On the assumption that the aspect is related to nudity, then the best comparison would be to unclothed plastic dolls or figures from classical art.