You could argue that such aversion is merely instinct. We want to survive so of course we would react negatively to death in some capacity. The fear of the unknown is probably stronger than any fear of death, at least for some people. We like to have security, I guess.I don't fully believe all the votes saying no. Most people faced with death, they might not fear the abstract concept but we have a natural aversion to death either our own or stagnant corpses.
Me personally, I'm afraid of dead things, generally. My own death, thinking about it, not so much fear as a range of other emotions. True fear, is more of pain for me. I'm deathly afraid of intense pain. I don't know if I'm more sensitive to sensations than others but everything always feels intense to me and pain is always freaking unbearable if it's truly being harmed. The only times it's not been for me is when I went into shock or was too concerned with surviving where more serious injury or even death was a real possibility. That aversion to death kicked in.
Maybe fear is the word for that, I don't know. But I think our aversion is on some level a type of fear of death. Otherwise we wouldn't work to stay alive.
But I do not fear death, nor am I without experience of death. In my family tradition we celebrate it, an end to a life means they will either go onto another life or become one with the One. Such a thing is to be revered, not feared.