I had my first one in HS. They used to hit you with the ammonia "smelling salts" and tell you to walk it off. I think I had others as well, the helmets aren't anything like they are today. Coach would tell me I did this wrong or I did that right, I didn't even remember the play. I had a bad M/C accident and even with a helmet on I didn't know where I was for about 2 days in the hospital, all I did was sleep. I'm 63 now and my brothers will tell stories of when we were in our 20's, there are holes in the story I don't remember.
If Wes Welker is prone to concussions he should rethink the NFL, take his money and invest in Berkshire Hathaway.