Nervous retirees often worry that they might lose everything in a volatile market. Yes, if you only own one stock, you could lose it all. But if your portfolio is diversified, the majority of it remains stable like the water beneath the waves.
Market volatility is not as scary as you might think. First of all, younger retirees may have a higher percentage of equity (stocks) in their retirement income portfolio, but as they age, it shallows out. The volatile part of the portfolio from stocks decreases, while the more stable part of the portfolio from bonds increases.