Oh, and since everyone else has done so I will expose my own super-dooper investment strategy, sure to leave me wallowing about on stacks of money in between catheterizations at the nursing home run by the nurses from Silent Hill. In truth, I have two: Pessimistic and Optimistic. Given: I have ~25 years or so until official retirement age as determined by gov't poo-bahs.
Pessimistic.
Assume it won't be there and I will have to work until the day I die, the last years a grinding struggle that eventually wears me out. Why? Any number of reasons, most tied to the short sighted perfidy of those in charge of gov't and finance. Civilizational collapse, financial collapse, gov't confiscation, whatever. Doesn't matter. We in America have had a longer flight than most and our current vector indicates accelerating impact with reality.
Optimistic.
I assume it will be there, but this is definitely a triumph of hope over experience and reason. As such, I put the minimum skull-sweat into it for the maximum rate of return. That means almost all in a market-following index fund (S&P500) with minimalist expenses (0.015% gross) for my 401k. I have little faith in the long-term efficacy of managed funds and see no reason to pay for that ineffectual management. The only fund available in my 401k with a smaller expense ratio is the company stock fund (0.006%). I have a serious minority of my 401k in that. Were I to leave the company I would roll it into something else as I would no longer be in the bubble. After that the next lease expensive to manage funds are a "total stock index" and an index linked to the Russell 2000. That gets up to 2x the expense ratio. After that it gets supid, expense ratio-wise. Given that the 401k options have expanded and contracted, but that there has always been a 401k index fund and a company stock fund, I park it there for a minimum of fuss.
Not saying either one of my "strategies" is applicable to anyone else. Will start moving over to bond, real estate, and other indexes as I get closer to retirement. Until then, I don't pay it much attention.