You can never take a holiday from math. Read this brief but wonderful paragraph from distinguished physicist and mathematician Freeman Dyson (retired but still flourishing at age 92!):
It’s the beauty of mathematics, as opposed to physics, that it’s forever. I published my selected papers recently in one volume, and I found out that when you publish your selected papers most of the physics is ephemeral, that you don’t want to publish stuff that was written 10 or 20 years earlier, but the mathematics is permanent. So essentially everything I’ve ever published in mathematics is there, whereas only about a quarter of what I published on physics was worth preserving.
Usually we notice the many similarities between math and physics. Usually we get the perspective of a mathematician or a physicist. It’s refreshing to hear from someone who is both.
Mathematics never goes out of date.