Fortune telling fish

One day he ate a fish. The fish had an even number of bones. He knew it for sure, he actually counted them after eating. He had a good day after finishing the fish. Everything happened that day went perfect, and the good luck continued that entire week, like never before. In fact, he felt good, full of something new. After that, every Monday he eats a fortune telling fish. When the number of bones is odd, he spends the whole week in bed, because the world outside could be dangerous, he is sure about the bad luck hidden inside odd numbers. After years of fish, he starts to look happier than ever before. Today he just finished another fish, but he feels weird. He did not find any bone at all. Not a single one. Today he did not know what to think: he could either die at the end of the day, or live forever.