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I don't think there's a general trend you can apply to all. Some people become more positive and happier as they age, and some indeed do get crabbier. But it depends on the person. But I will say, I've given up trying to read or understand people. Lots of folks drug themselves to keep themselves happy with drugs, booze, happy pills, food, sex or other methods. People get better as they get older of hiding what's really inside. You never really know what is going on behind closed doors.