That may be it, I will probably outlive my other possessions.
Runners-up:
We are still using a Dyson vacuum that my uncle gave me, used, when he got a new one, at least 15 years ago. Longer I think, and don't know how long he used it before that. And just replaced my KitchenAid mixer with a bigger one and gave my old one to one of my kids, that was 25 years old and is still going strong.
It's still pretty new and made of "weardeck", made to last in the Florida sun, can be used for docks & similar, so I don't know yet but not worried. We got a light color (so it would be cooler) and my only gripe is that I didn't think about how bad dirt would show on the lighter color. We love it. Lifetime warranty for residential.