Have colds gotten worse? Used to last 2-3 days, now they linger for weeks

I remember colds used to last only a couple of days—maybe 3-4 max—but recently, whenever I get sick, it drags on for weeks. It starts like a normal cold, but the lingering cough, congestion, and fatigue just won’t go away. I know others who’ve noticed the same thing.

Is this just bad luck, or has something actually changed with common viruses? Are colds getting worse, or is my immune system just weaker? Anyone else experiencing this?