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I consider myself a casual fan. I'd say the life span depends on the lifestyle and eating habits. Some people can live to 90 and some may get a heart attack at 50. I don't really think you can narrow it down that easily.
As for growing out of it, it isn't too hard. If someone has interesting things going on in their lives and they aren't super long term hardcore fans, it's just a matter of getting distracted by more interesting events, if whenever they happen.
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