Maybe it's because they are easier to use. Older people might not use digital maps much because they're not used to the technology. They know paper maps better. Also, finding your way from one place to another with a paper map feels like an achievement, since you need to think more about the journey.

I think it's about being reliable. Paper maps are always there for you. They don't need a network or battery, so they're more dependable. It's a hassle when our phone dies while trying to find a new place, leaving us lost. But a paper map doesn't have that problem.