Why do people think men are that stupid and incapable of growing up at 30? Why men still acting like children at 30?

Many people in this sub talk about men like were not grown ups, and that we are mentally children until 30. Why did you do that? I did not hear a single man saying that women are not fully grown until 30. Why do you act like we are immature?<br><br>Edit: I am not trying to offend women in here, I am just trying to understand why alot of women see men like that