As the brain gets older its Brain plasticity decreases. meaning its ability to change goes down. As result, older rich people may lose the capacity to stop obsessing over making money.

Bill gates, Trump, Biden, etc. They are stuck in the era where they needed to make all the money in their youth, forever, unable to just say "I've made enough".

Which is how you can get a nearly 80yo, rich man trying to sell you NFT trading cards or gold sneakers.