This "milk is not for adults" thing is bs, unless you are lactose intolerant or allergic to caseine there is no reason not to drink it. Pasteurization, contrary to what a lot of people seem to believe doesn't involve adding chemicals or anything like that, it's literally just heating it up to kill dangerous bacteria, again there is no reason not to do it.
Discussion
Pasteurization kills everything beneficial, particularly lactase (the enzyme that helps break down dairy), hence lactose intolerance in many. Nobody thinks pasteurization involves adding chemicals. I drink raw milk all the time, for many many many years. WHy am I still alive if there is anything harmful about it?