He did it because he felt good doing it, and also to be healthy. He started thinking more and more about meaninglessness in maintaining for long-term health.
I think it’s also helpful to point out that we should be good Bayesians and not believe anything 100%. It seems to me plausible that in 20 years, AI may not change everything, but maybe we will be able to reverse aging (or maybe AI will change everything and we can upload our brains). With some chance of indefinite lifespan, I think some effort into health in the next 20 years even if one is relatively young could have a big expected value.
I think it’s also helpful to point out that we should be good Bayesians and not believe anything 100%. It seems to me plausible that in 20 years, AI may not change everything, but maybe we will be able to reverse aging (or maybe AI will change everything and we can upload our brains). With some chance of indefinite lifespan, I think some effort into health in the next 20 years even if one is relatively young could have a big expected value.