Garbage disposals, life expectancy of
We are replacing our laminate counters with granite, and our drop-in sink with an undermount. We have a disposal that's nine years old, a 3/4 HP KA. It works fine, and we don't give it a lot of heavy use. The granite place told us that they would not guarantee reinstallation of an old disposal (against leaks, etc.) and recommended that we get a new one. I hate to throw out a perfectly good appliance if it's not necessary.
So my question is, how long do these things usually last? If we can get another 5 years or more out of it, it seems like we should keep it, but if it's almost at the end of its useful life, we might as well get another one now.