I have no idea how old it is. If I had to guess, it is probably 20 years old.

It is a refrigerator/freezer, with the freezer portion on top, frost free. It seems to work well, other than never shutting off. It doesn't appear to be a thermostat problem -- the freezer and the refrigerator always stay at the desired temperatures.

We'll probably just keep running it until it quits, and then either take it down the street to the repair shop (probably would cost about $30 to put a new compressor in it) or give up and find another yard sale.

Or, perhaps it would make sense to be pre-emptive and take it to the repair shop before it quits...

tanstaafl.