I think the same could be said about many stars from the past. However, these guys were exceptional athletes of their time, and they trained and practiced to the standards of their time (one image that comes to mind is that of Len Dawson smoking a cigarette during half-time). I have to believe that if they were coming up today they would be doing the same thing we tell our own kids to do - hit the weight room, nutrition, etc, etc and they'd have the metrics they need to go along with their exceptional talent.