While Avengers: Endgame did revive a lot of previously dead heroes, the robotic Vision was not seen anywhere.
To start, Avengers: Endgame introduced time travel, and the machine used to travel through the Quantum Realm was intact at the end of the movie.
This means it’s possible for the 20-something Wanda to live in the ’50s with Vision, provided Vision is alive.
Additionally, his creator Ultron is long gone, so unless he left blueprints behind and the Avengers have a mind stone, rebuilding him will be an issue.