Does travel get boring after awhile?

I'll give my story... 40 years old, 50+ countries... And while I still love the aspects of it... there's no way in hell I can do month long expeditions like I used to. Hell, two weeks feels like too long... And even though I love it still.. it's just not as exciting anymore.. I don't know if that's age or boredom.
Does travel get boring after awhile?
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