Most people have a fear of death—it's part of being human. Often it hits in the moment, like after a near-miss traffic event or on discovery that a loved one needs surgery for an illness. However, it can also linger in the background, particularly around significant birthday milestones or when we're sleepless and pondering life's big questions. This fear can begin to shape a character's life in negative ways when it holds on or may become a phobia if the fear causes panic and anxiety when no logical threat is present. 

Following safe practices (wearing a seatbelt, locking doors, paying attention to expiry dates, washing hands)
Researching safety ratings before making purchases
Focusing on staying youthful (skincare routines, healthy eating, and exercise)
Avoiding news articles and programs that mention death
Worrying about loved ones and needing them to check in more frequently 
Overthinking things when it comes to what could go wrong
Struggling with decisions that carry risk (going in for a surgery, flying, becoming a passenger in another's car)
Opting for quieter yet longer drives than the freeway
Avoiding those who are sick or dying
Paying more attention to their surroundings, especially in new environments
Pausing to assess risks over spontaneity
Shying away from potentially dangerous or thrill-seeking situations (skydiving, storm chasing, running at night, etc.)
Avoiding cemeteries, funeral homes, and other places associated with death
Not celebrating Halloween, the Day of the Dead, and other holidays related to death