I guarantee you, a 5800X3D will last longer than a 7600X. Or a 9600. They will age the same, and the 5800X3D will perform better than the 7600, or ~roughly match the 9600, the whole time.

And there's no feature or specification AM5 CPUs have over AM4 that games will need in 4 years.

Again, this might be different if we were talking some specific software outside of games, but that's how games are.