The only problem with that is we are living longer and longer, but wanting to retire earlier... it's really an individual thing, and you have to make sure that whatever you're invested in, you will have the principle + earnings to be able to cover your needs for however long you live.

Keep in mind that costs for elderly care have gone nowhere but sky-high in the past decade or so. It's not crazy to plan on paying 10-25,000/month once you reach your 80s or 90s (or more if inflation rises).