When did you first learn death was a thing?

I don't remember but I freaked about it quite a lot when I was a kid. My paternal grandmother died shortly after I was born so as I was growing up I was being reminded of the fact that someone that normally should have been there wasn't. So I got the concept of absence quite early. Anxiety from understanding that anyone close to me could die any given day came a little bit later. Maybe when I was 7 or 8.