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There are many different reasons we tend to have less fun and joy in our lives as we get older: we have work and kids and other responsibilities, we realize what a bad and sad place the world can be, our body starts hurting, but maybe the saddest reason is that it just never occurs to us to do fun things, we forget how, or we're waiting for some kind of permission or go-ahead from life. Good news is, they also may be the easiest to overcome.