Jellyfish tend to live for about one year. If jellyfish don't live for about one year that is probably because another fish, turtle, or bird eats it. Another way they could die early is if they aren't in salt water. Jellyfish have to be in salt water to be able to live.
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Jellyfish lifespans typically range from a few hours (in the case of some very small hydromedusae) to several months. Life generally ends after the medusa has begun spawning. Life span varies by species. Most large coastal jellyfish live 2 to 6 months, during which they grow from a millimeter or two to many centimeters in diameter.