Just maybe not during your story.
How do they feel about that? Do they think about it at all? Is it a constant fear? Is it something they acknowledge but don’t strongly internalize?
What do they think death is? Do they see it as an end? A beginning? A transition in a cycle?
Where do they define death? Is it clinical, or is there some kind of loss that to them seems close enough to count as death?
What they think of death, or if they think of death, has a profound impact on how a character makes decisions. This isn’t just about stories that deal with death outright. Just because a character isn’t racing to complete a bucket list or facing imminent annihilation from an alien horde doesn’t mean their feelings on death don’t play in to how they live.
This Builds Character 
I generally don’t like hijacking posts to let bloggers know about award nominations but I couldn’t find an about page. I wanted to let you know that I nominated This Builds Character for the Super Sweet Blogging Award. The other nominations and rules for participation are at http://aprobertsstories.wordpress.com/awards/super-sweet/