I have a few categories that I feel each need to be an answer to this question.
I don't fear death too much. I just hope I don't die from a fire of some sort. My dad is a firefighter. I've seen pictures. I've been shown these photos in order to be safer in the future with fire prevention. He also showed me the Station House fire in CT for the first time. I scope out fire exists in every new building I step in now. His handling of this is both incredibly cruel and has added a gigantic fear to my life but is also very responsible and has caused me to really be safe about these things. I check outlets and stuff a lot. I've caught two fires before they got out of control at friends houses because of this.
An immediate physical fear I have is heights. That one grew as I got older. I used to climb trees and sh*t. I can't do that anymore. I get panic attacks, albeit small, when I do touristy things like climbing bell towers and stuff. I did the Precipice Trail when I was in Acadia and it was basically an hour long anxiety attack all the way up. Looked like this...
Finally, I've been having a lot of existential fear lately about the people I love. So I guess, right now, the biggest fear I have as I get older is losing the people that I rely on for guidance, company, and love. The fear of being alive yet alone is just something I'm not ready for even though I genuinely like being alone. As much as I am solitary, I love calling my friends or having dinner with my family. I just like to spend my free time by myself. The fear of never knowing when our time will be up is what scares me the most.