Modern mixed martial arts is not quite 15 years old, so it’s still a relatively young sport in terms of its development.
That may seem like a long time to someone who fits into the sport’s leading demographic age of 18-34, so it requires a little perspective to understand that MMA is really still in its infancy.
Fifteen years after the 1920 founding of the NFL, the Philadelphia Eagles and Washington Redskins were each less than three years old. The Chicago Bears’ Bronko Nagurski was the sport’s biggest star and Vince Lombardi was still a college student, more two decades before he became Green Bay Packers coach.
The game has changed dramatically in the 74 years since.Link