The fact that Bull is still alive. 
He's a little irritating sometimes, he hates elves, and his sense of humor is all messed up, but I hardly see that as a reason for us to kill hi--oh! Oh, wait. You meant the character. Right, right. Carry on.
Yeah, the character Bull is in his 40s, which in orc years is dead, forget still working the shadows, even as a fixer.
I wouldn't say "dead," but "old," yes. Keep in mind, "average lifespan" is not "absolutely drops dead." It's
average lifespan. A 40ish year old ork, even one that was born ork instead of goblinizing -- ignoring the dangers inherent in being a Shadowrunner, for the moment -- is no more automatically dead than a 60ish human. And, again, this is all ignoring leonization (which someone with 20+ years as a shadowrunner, profits and all, would certainly have been able to take advantage of).
Bull, even if he was born ork, isn't automatically dead or even dead weight, any more than, say, Fianchetto is, or FastJack, or Damien Knight. Age, even accelerated age for an ork, does not
automatically mean death, or even utter obsolescence.