Interestingly coming from similar generation, I also did such thought experiments. As a researcher I look into possibilities of hypothetical 1000 years life span and documented my perspectives in an article in 2021. https://medium.com/sensible-biohacking-transhumanism/can-we-really-live-1-000-years-d9609919d28f

I like the title and subtitle of your story as I choose the heroic path and accept my mortality making it a daily practice to enjoy every moment of my remaining time on this planet as explained in a recent personal story like yours. https://medium.com/sensible-biohacking-transhumanism/why-envisioning-death-a-few-minutes-daily-makes-me-livelier-and-happier-7459440aa325

Thank you for writing this valuable piece which gave me a glimpse of your inner voice and interesting thoughts and feelings about immortality.