If I could use the money to reform all economies to have a land value tax and implement a -5% interest rate on cash then surely the importance of the bottom 95% of humanity's billions of years in aggregate would massively outweigh 20 of mine. Not to mention that I myself would benefit from peace and stability which could be worth 20 years if I were to die in a conflict that cuts my life short, not to mention all the technological progress that would be accelerated and thereby improve the healthcare system.