One of my best friends in primary school never said a single word all through primary school, not one word. Now he works as a successful I.T. person in Sydney in a super busy office. Guess he outgrew it!

My twin daughters friend at school barely speaks and has a diagnosis of selective mutism. She does talk at home though, just not at school or in public. She goes to the special Ed room at school during the day so she doesnt have to spend lunchtimes in a crowd.
She is definitely getting better than she was in primary school though.