I think you are under-estimating the percentage of trolls that are grown adults.
Then again, I grew up in a place where the local paper's letters to the editor read like a best-of collection of racist trolling (pre-internet, even.) Most of the letter writers were over 70 and still spouting ungrammatical poorly-articulated vitriol.
Then again, I grew up in a place where the local paper's letters to the editor read like a best-of collection of racist trolling (pre-internet, even.) Most of the letter writers were over 70 and still spouting ungrammatical poorly-articulated vitriol.