Some people, as they move through life, begin to feel out of touch. It may start with the interests of younger people—music, apps, gadgets, etc.—and extends to a general feeling of being left behind. But it’s all a matter of perspective.
As you get further down your path, you should feel more and more confident, and increasingly trust your judgement based on your experiences. It’s not necessary to like, or even be aware of, every new trend. You should remain open to new ideas or experiences, but should not worry about those that don’t interest you—don’t think that you’ve become irrelevant just because you’re not engaged in the latest rage. Develop a balance between what’s known and comfortable and what’s new and different. And trust yourself to know what you like.