Children as young as 7 can be taught to use urine color to determine if they are dehydrated, especially if descriptive words or phrases are used that they are already know: Light yellow or relatively clear urine ("lemonade") means the athlete is hydrated. Bright yellow urine ("mellow yellow") means that the athlete is slightly to moderately dehydrated. Brownish urine ("apple juice") means the child or teenage athlete is severely dehydrated.