Q: We have old toilets in our bathrooms, but they look fine. Is there any reason to replace them?
A: The toilet itself doesn't wear out, but the flush mechanism in the tank may need to be replaced. When people do replace the entire toilet, it is usually for aesthetic reasons.
Something to keep in mind is that the federal government outlawed the installation of the standard toilet homeowners have installed in their bathrooms for decades. Now, you must install a toilet that only uses 1.5 gallons of water per flush.
While this new requirement probably benefits Mother Nature, many people find that the new toilets don't flush as well. In fact, dissatisfaction with the new toilets has created a black market in the older, water-wasting models. So, you may want to think twice if your older one is still in good condition.