This doesn’t just apply to someone who is ninety years old. Warren can use money to free up his time so he can do what he likes – which in his case happens to be making money.
What we do with our time will be different for you and me [1], but as Morgan Housel said in his book The Psychology of Money, Time is the highest dividend money pays. The sooner we internalise that, the sooner we will understand why we trudge to work to make money.
[1] Discovering what you’d do if you could do anything with your time is a journey in itself.