It would come as a revelation to no one if I said Wanderlei Silva's best days are behind him. It would warrant no gasps if I wrote that Antonio Rodrigo Nogueira is fighting past his prime. And it would come as no shock if you heard that Matt Hughes is on his last legs.
It is not my intention to construct a list full of fighters so obviously shells of their former selves that it makes MMA fans tear up recalling the glory days of heroes and legends passed.
Instead, this list will be populated by fighters that still rank as contenders; fighters still putting in competitive bouts with ranked opponents; fighters that may not so obviously be entering the twilight of their career.
As a note on the criteria for this list, no fighter with a lengthy losing streak, a la Kid Yamamoto or Yoshihiro Akiyama, will be included. Their recent records speak for themselves.
This list will only concern itself with fighters that may reasonably be considered threats within their respective divisions.
It is also necessary to explicate that this list is not meant to label fighters as "overrated." Many of the inclusions are exceptional combatants that will continue to put on competitive and exciting fights for years to come.
More than anything else, this list is comprised of fighters that are currently, or were recently, considered title threats, but have seen their opportunities pass them by.
These fighters have risen to the zenith of their careers and will go no further.