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Should I scale down my 401k?
Because stock markets don't always go up, sometimes they go down. Sometimes they go way down. Between 2007 and 2009 the S&P 500 lost over half its value. So if in 2007 you thought you had just enough to retire on, in 2009 you'd suddenly find you had only half of what you needed! Of course over the next few years, many of the stocks recovered value, but if you had retired in 2008 and depended on a 401k that consisted entirely of stocks, you'd have been forced to sell a bunch of stocks near the bottom of the market to cover your retirement living expenses. Bonds go up and down too, but usually not to the same extent as stocks, and ideally you aren't selling the bonds for your living expenses, just collecting the interest that's due you for the year. Of course, some companies and cities went bankrupt in the 2008 crisis too, and they stopped making interest payments.  Another risk is that you may be forced to retire before you were actually planning to. As you age you are at increasing risk for medical problems that may force an early retirement. Many businesses coped with the 2008 recession by laying off their older workers who were earning higher salaries. It wasn't an easy environment for older workers to find jobs in, so many folks were forced into early retirement. Nothing is risk free, so you need to make an effort to understand what the risks are, and decide which ones you are comfortable with.