1) they almost always overestimate what expenses will be under normal expenses
2) they always underestimate if the retirees are paying for grown children expenses
3) they always underestimate taxation. You are not going to be in a lower tax bracket if you have saved your whole life
4) Once you have a house paid for and your dependency rate very minimal oz Ed, life doesn’t cost very much. That is where people start spending on travel etc
5) there is real fear over 50 of losing your job and not making your goals.
6) for those that lost a bunch during the Great Recession, you can never be too careful