I am retired. This should be obvious, but there is so much you just can't anticipate. I thought we were fine at first, but now I wonder. As you get older, a lot of you, like me, will be more and more risk averse. So your investments languish as you play it safe. Then insurance goes up 30%, utilities go up significantly, the cost of Coca Cola doubles, all within just a couple years. Taxes just seem to hit you everywhere you turn, and especially once you get to RMDs on your untaxed savings (starting in a couple years for me). The future cost of living just really looks expensive to me now, which I didn't sense when I retired. I just feel now like most people are going to need more than what they think.