For me, the biggest tell was how frequently older people report feeling completely at peace and ready to die.

As my own life progressed, the feeling of novelty became harder to find, and then less important. Grief became easier, death became lighter.

As I deepened my investigation into the nature of my own experience, I started to realize that "I" do not exist in the way that I originally assumed, and I started to wonder what we're even talking about when we talk about death. Who or what is dying?

The self, time, and consciousness are not well-understood in philosophy, science, or the experience of most people, and as such, most conversations about immortality are really about something else.