I think he means that stock picking is way more dangerous than a well diversified "safe" Fund like most retirement accounts push you to invest in (with high management fees of course).
The typical guidance is to shift towards bonds and short-term instruments in a fund or ETF over time. The problem with that is that the yields have been poor for many years.
A nominally safe investment like the Vanguard Short Term Gov Bond ETF is down in real and nominal terms over the last decade.
edit 1.75%
extra tennis balls for your walker