enriquelee, Xccess - do your mirrors get dark spots (some called it oxidization / de-silver / mirror rot) after some time?

I noticed Enriquelee's alluminium frame seemed to encapsulated the edges, while Xccess's wooden frame exposed the edges and I wonder would that make it more susceptible to oxidization?

I wonder whether in malaysian market there is really high quality mirrors that do not oxidize, a least in say first 5 yrs?