Answer: The maples (Acer spp) are such a diverse group of trees it is just about impossible to define lifespans that way. Some are potentially longlived trees (sugar maples) and others are relatively short-lived as a rule (box elders). To get an idea of the types of things that could shorten a maple's life, you might be interested in the information at this web page http://www.ext.nodak.edu/extpubs/plantsci/hortcrop/pp697-3.h... which details some potential problems. I'm sorry I can't be more specific.
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