youre mad because youre 10 ; )
I've never heard someone call someone a 40 year old as an insult.
when little kids get told to shut the forget up by someone with a deep voice they pull the whole "hey why are u so cool if you're this old and still playing video games" card, usually "dude you're like 40 and playing tf2"
I once met a legit 60 year old guy who loving annihilated the enemy team in tf2.Apparently he played FPS' since the day they were even a thing so he has DECADES of experience.