You don’t have to be young to make a stupid mistake, but it helps. Youth doesn’t comprehend danger or consequences. Maybe there’s an evolutionary reason for that. Maybe if young people were cautious and mature, no progress would ever be made, nothing new would ever be tried.
A lot of young people have been injured or even killed doing stupid things. How can that be a valuable trait? As a person, I take a personal approach to stupid mistakes, especially those made by my own children, who I am trying to protect from harm. But in evolutionary terms, do individual stupid mistakes matter? Do individuals matter . . .