If you’d have been invested in 100% “aggressive growth” stocks over the last two months (for example, young software companies with very high sales growth), you’d have gotten absolutely slaughtered. A bloodbath. Whether you call it a “rotation” or a long overdue “correction,” is irrelevant. The mistake we are talking about is, of course, the failure to prudently diversify your portfolio. We’re not suggesting anyone be a “closet index fund,” but for goodness sake, don’t put all your eggs in one basket. In fact, don’t even put most of them in one basket. You’re too darned old for that crap. And if you don’t know what we’re talking about, for your reference, check out these 7 Deadly Sins of Long-Term Investing (too many eggs in one basket is on the list).