re: How much money do people need to retire?

I read an interesting book called “Die with zero” which had several interesting concepts. One of them was “time buckets”. - essentially you’ll be spending less and less in retirement the older you get due to physical limitations. Most people say they want to travel and put those in the numbers, but few people are healthy enough in their late 70’s/80’s to do so. So the end up working longer than needed unnecessarily. Encourages people to use money for experiences and to give $ to children/charity earlier rather than inheritance to kids when they are 50/60.