If you’re over 65 or are working or exercising in the heat, drink enough fluids to keep your urine almost colorless.
For younger people under normal circumstances, simply drinking when thirsty will provide adequate hydration. Urine’s normal color comes from a pigment called urochrome (from the breakdown of red blood cells) and ranges from very pale yellow to amber. More concentrated urine is darker yellow, an indication of dehydration.
Some dietary supplements, drugs, foods and medical conditions can turn urine some surprising colors.