This is fascinating. It reminds me of a line from Hamilton: "I imagine death so much it feels more like a memory". Lin-Manual Miranda has said that was the most auto biographical thing he's ever written and that he thinks his drive and positivity both come from that attitude.

I wonder if there's an easy way to replicate the exercise yourself. Perhaps every month write a letter to be read out at your funeral? One idea I had years ago but never did was to make a short video for my funeral every year where I shared my thoughts, fears and hopes and where I was in life. The idea was I could look back in future and see how far I'd come, but that it would also be useful exercise at the time.