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Why do people age so differently? Why are some people mentally sharp, energetic, and still excited about life while other people, much younger, are sick, exhausted all the time, inflamed, and always foggy? What’s going on? Sure, we are all born with a set of genes, but the way you live can influence how your genes express themselves. In many cases, lifestyle factors, i.e., choices can switch genes on and off. The idea that your metabolism slows with age is just another myth.