The amount of money you’ll need in retirement is often a lot lower than what you’ve been advised to save. For example, if you’ve been told that during each year of retirement you will need 80 percent or more of your annual pre-retirement income, you will probably discover, after looking at the activities you’ve bucketed for your seventies, eighties, and beyond, that these really don’t cost that much—far less than 80 percent of your previous spending.