A couple of times a year it is important to take a close look at who the young up and comers are in the sport.
Although it is a sport that is in it's infancy, time can pass quite quickly for those of us paying close attention.
We have seen tons of young dynamos rise up and entrench themselves into the spotlight, but for every batch maturing into veterans, there is a new batch hungrier and more talented than the last.
Some are practically veterans by the age of 25, while others are hot prospects with unlimited potential.
These are the top 25 MMA athletes that are 25 years or younger.