Low levels of vitamin D in the population as a whole suggest that most people need to take a vitamin D supplement. This may be especially true for seniors as the ability to synthesize vitamin D in the skin declines with age.
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I think that everyone at any age should ask themselves 'where do I want to be today where do I want to be tomorrow and where do I want to be in a hundred years?' We all have clear answers to those questions. We only have so much time. It's a real shame if we don't spend our lives trying to do that.
