Expansion tanks typically last about 5 years so you need to check it once a year to make sure it's not full of water. Just tap on the top and bottom with something metal like a screw driver. The top section should sound hollow if the tank is good.
Also, many just don't realize with a very old water heater, there is probably a lot of sediment and rust inside the tank making it very inefficient even though it's still working and not leaking. Changing your tank water heater at the end of it's warrenty life will save a significant amount of money in the long run.
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