I retired unexpectedly early (at 61 instead of 65, because I got sick of the politics) so our portfolio was aggressive for the average retiree. I've decided I like it that way. (I say "I" because I manage the money, but DH is on board with it.) If your withdrawal rate is low enough (ours is typically 3% and I'm not collecting SS yet), you can withstand a drop in the market; you're not liquidating a big % of it at bargain-basement prices and the rest is left to recover. The good stuff will recover.
The other thing I've done since retirement is track our expenses carefully (there's another thread on this). It gives me comfort that our necessities (mortgage, property taxes, groceries, utilities, travel to see the grandchild, etc.) net of DH's SS and my small pension are a pretty low % of our assets so if we needed to scale back in a bad year for the market, there's plenty of wiggle room. And we'd still go see the grandchild!