Pac's not even 34 yet, so no need to retire 'cause of age. However, we've seen Pac on a gradual decline, to the point where it's been speculated whether his heart is still in it. He gave it a good go last night, but Marquez just has his number. If Pac wants to continue for the right reasons, no reason for him to retire. But if he's not 100% into it, he could end up getting hurt worse.