How should I care for sensitive skin?

As I get older, my skin has become much more sensitive. How about you all?

I used to be fine using any cosmetics, but lately I'm very worried because my skin seems to have turned sensitive, causing my face to turn red even when I'm just a little tired.

Even though I've been looking for non-irritating products, it's difficult to choose because there are so many options for sensitive skin. Are there any people out there who, like me, suddenly developed sensitive skin as they got older and could recommend some gentle cleansers or basic skincare products? I would love to hear advice from those with similar concerns.