In an environment defined by market uncertainty, gold's retirement role has become harder to argue against. Creativ Studio Heinemann/Getty Images Most retirement portfolios were never really built for today's economic landscape. The classic 60/40 split — stocks for growth, bonds for stability — made perfect sense in a world where those two assets reliably moved in opposite directions. But that relationship has grown to be unreliable. In recent years, issues with inflation, high interest rates and geopolitical turbulence have managed to drag both equities and fixed income down at the same time, leaving retirees with fewer places to hide.The stock market's recent volatility has only sharpened that anxiety. Tariff threats, shifting Federal Reserve signals and global instability have kept investors on edge over the last year, and retirees, who don't have the luxury of waiting out a decade-long recovery, are feeling that pressure more acutely than most people.…