One often-cited guideline for determining asset allocation when planning for retirement is that you should subtract your age from 100 to find the percentage of your investment portfolio that you should keep in stocks. For example, it suggests if you're 40, you should keep 60% of your portfolio in stocks. And if you're 50, you should reduce that ratio to 50% with the remainder in other sources like bonds and cash equivalents.
It's tempting to reach for a solution to deal with something so comple