There is couple my Parents know, prudent with money, and quite a nest egg from smart investing.
When he retired, his pension was enough to make a house payment. Today, it will barely buy some groceries.
His Wife got quite ill and required around the clock care, depleting the $ at a much more than projected rate.
He will run out of money late this year.
He has a Son who is well off from selling his business and will be able to cover the living expenses.
You never know what circumstances could throw a planned retirement into turmoil, regardless how much $ you think you need!