Death

Yes, marshmallows die.

Unlike non-awakened marshmallows, they last a lot longer. The way marshmallows grow, is that their bodies dehydrate themselves regularly which cause their bodies to become puffier, though over a lifetime...they don't puff up that much. As moisture gets into the air sockets of marshmallows, they collapse. Old marshmallows are usually kept in air tight houses, made out of bread, It is kind of their own retirement home. Bread pull moisture away from the marshmallows, keeping them fresher for longer.