There seems to just be more awareness since you are forcing yourself to learn to deal with new environments.
I wonder if there's been any kind of study on frequency of moving or travel on the brain.
Have you ever noticed how sometimes when you read a really interesting book, and you learn some really key insights about the world, suddenly, you get a burst of new ideas? As though a flood of neurotransmitters has just been released?
Maybe that has health effects related to dementia.
I'm wondering if that relates to your anecdote, and how much impact traveling vs languages help.