I am not sure anyone can ever be completely assured that they have saved enough. Too many unknowns in regards to health, how long you might live, and investments. Even traditional "safe" investments can be jeopardized if the economy were to collapse. I believe you have told your kids the right thing as far as saving as much as possible in a 401k. In retrospect though; I wish I had saved more in an after-tax account. I now have concerns about being taxed on the money saved. I knew it would happen, but chose to not be concerned when I was saving. That "nest egg" looks significantly less when considering those taxes. It looks even more grim when considering that our government may decide it wants more of that savings. Just my 2 cents worth.