Face it. If you were born, you're gonna die. Somehow. Somewhere. Sometime.
My advice is to stop worrying about the somehows, somewheres, and sometimes. Live your life to the best you can. Do the most good for yourself and for those around you.
My family's genetic heritage says that I'll live into my 90s (I'm 72 now), and my greatest fear is that I'll have to live into my 90s!