After The Outsiders

I read this article written by some anonymous person and they were talking about how after the book, Soda and Steve go to Vietnam where Soda is killed two weeks short of his 19th Birthday. Steve returns addicted to drugs . Either he eventually kicks the habit and becomes a drug counscellor.
Pony gets a scholarship to college and becomes an author writing under P.M Curtis. Darry works hard at his job and becomes quite succesful( i think). I think Two-Bit has a child when he is 19 and is a deadbeat dad, paying child support when he can. I think he went back to school again but im not really sure. Does anyone know what really happened or did someone just make it up. I know S.E Hinton told Rob Lowe Soda died in Vietnam when Rob asked. But Rob said it was just to help with his character.

Thanks in advance!!!