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The urinary... How does it change with age?

We may note with age the changes in hair or bones, but there are other less visible changes occurring within the body, specifically at the level of the urinary system. Both kidneys and bladders do not maintain the same efficiency over the years, which may lead to different symptoms and problems from one person to another. What exactly changes? How can a distinction be made between what is natural and what requires medical follow-up?