Compared to the likes of the NFL, MLB, NHL and NBA, the UFC is still a very young sports organization.
Some of the promotion's original stars still step inside the Octagon today. However, the time is drawing near for some of those UFC legends to call it quits. Several of those historical MMA figures are likely to fight for the final time at some point in 2013.
B.J. Penn returned from a temporary retirement in late-2012, but a loss to Rory MacDonald could prompt him to retire for good in the near future. Others won't be far behind, so let's take a look at some fights that should be made to help say goodbye to those who have helped grow MMA over the past several years.