Haha.
It's actually remarkable how little Tolkien runs afoul of linguistic shift or variance ('wrench' as a tool isn't British English use; we'd say 'spanner' usually). There
are other cases - Tom Bombadil springs to mind, with "soon you will be groping!", and then there's Sam describing Elves as 'gay and sad' - but by and large he's managed to avoid it.
hS