Celebrities don't die in weird ways any more than the general population does, they just get a lot more press coverage. For example, a 74-year-old man like Dennis Hopper dying of prostate cancer, there's nothing unusual about
that. Gary Coleman was apparently born with a number of genetic problems, so it could be considered amazing that he even made it to the age of 42.
The modern-classical composer Elliott Carter is now 101 years old and is still writing music (he may be hanging around until he finds a listener who can understand his works...
I sure don't). William S. Burroughs (the author who coined the term "Heavy Metal"), lived to the age of 78 in spite of a lifetime of using every narcotic drug he could get his hands on!
It's all a roll of the cosmic dice and nothing more, if you ask me. Anyone who could accurately predict lifespans would make a fortune at it (pun intended).