When I came back, I was only about three years older. We spent most of the near the speed of light so there’s time dilation effects.
Earth is gone. At least, my Earth. The cities aren’t even in the same places, and I don’t speak the language. It sounds vaguely asiatic to me, with maybe some Spanish thrown in… it doesn’t matter. There’s only the one language, oddly. I’m learning a basic vocabulary, and I keep asking for a history book, and they keep promising to bring me one, but it never seems to appear. I suppose I’ll learn eventually.