@Tamerlane Strictly speaking, it's not an isekai despite being tagged as such; he's from the same world he reincarnated into, after all.
That does raise an interesting question, though: an isekai is about someone going to a different world, so should it apply to those cases where the protagonist reincarnates into their own world, but at a significantly later date? While it's the same world, it could be argued that the world-state is so drastically altered from what they know, it might as well be a different world.