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IMO.. Regardless of the age of the reviews, when you respond in a professional, understanding & helpful manner, this will help new visitors/potential customers to see that you care, and take the time to engage in the reviews left about your business. Good or bad, reviews are helpful to both potential customers as well as the business itself. As the business owner, this helps us understand how we can improve our service/product/customer support. I would go in and leave a reply to all reviews, Good & Bad and regardless of the age. It will only help the users. Good luck SEOSnyder!!