It's fine to stop learning at some point. But that's for when you're retired. As long as you still opt to work (and a congressman definitely had the option to retire), you also have to keep up with the world.

What do you mean by "fine". Is it legal or your own choice? Yes. Is it healthy? I highly doubt it. Will it cause harm? I'm almost certain. I think I've read plenty of researchers advocating continued learning as essential, but I can't cite it..

Here's a preview, from one perspective:

We are emotional creatures: Emotion, much more than anything else, is our experience of the world, and it is a major input in our perception, decisions, and actions.

Many people reject their emotions or are ignorant of them. And life experiences often cause a lot of emotional injury, to the point where older people reach their limits (I suspect you have a good sense of that at your age) and shut down.

The effect of that shut down - well see the first paragraph; that all deteriorates significantly. It cripples experience and ability, including good judgment, and it causes people to avoid new experiences - the experiences might be traumatic, and the skill of learning and exploring atrophes. Also, shutting down doesn't actually do away with the emotions; they come out and people become angry and cruel.

Instead, we need to learn to be resiliant, to build our emotinonal capacity, and to experience life and use our well-honed emotional insincts as hard-earned wisdom. That includes exploring and learning new things.