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Though you can leave the plant in the same pot for many years, as long as you are not overwatering it, changing out the soil every two to four years will give you a chance to inspect the roots for any damage or rot. Additionally, giving the plant some fresh dry soil will make sure the plant continues to flourish. If you notice that a Jade plant you've had for many years is not doing well anymore, replanting it may help it spring back. If your plant is dusty, you can use a soft cloth to gently remove dust. Alternatively, if it is a rainy day, it is OK to place the plant outside, which will help rinse off the dust. Make sure, though, that if the leaves get wet, they are able to dry out completely. A plant with water left on the leaves may rot or grow mildew. It is not a common problem, but Jade plants can become infested with bugs. If you notice a problem with small mealybugs on your plant, use a bit of rubbing alcohol and a cotton swab to gently wipe down the leaves of your plant. When looking for bugs, look for small, fluffy, white deposits on the leaves. These are a sign that there are bugs. Additionally, you can use a magnifying glass to identify red spiders, which are too small to see with the naked eye. Avoid using an insecticidal soap on your plant as this may damage the leaves.
Change the soil every two to four years. Wipe down leaves to remove dust. Take care of any bug infestations.