Good number for percentage of body fat?

I have a scale that you program with your height, age and male/female. It'll tell you what your weight is, % of body fat and water. What are good numbers to see as far as Body Fat and Water %

Public Comments

1. 18 %
2. Women Age Underfat Healthy Overweight Obese 20-40 yrs Under 21% 21-33% 33-39% Over 39% 41-60 yrs Under 23% 23-35% 35-40% Over 40% 61-79 yrs Under 24% 24-36% 36-42% Over 42% Men Age Underfat Healthy Overweight Obese 20-40 yrs Under 8% 8-19% 19-25% Over 25% 41-60 yrs Under 11% 11-22% 22-27% Over 27% 61-79 yrs Under 13% 13-25% 25-30% Over 30%
3. (fat) Women (%fat) Essential Fat: 10-12% Athletes: 14-20% Fitness: 21-24% Acceptable: 25-31% Obese: 32% plus Men (% fat) Essential Fat: 2-4% Athletes :6-13% Fitness:14-17% Acceptabe: 18-25% Obese: 25% plus (water) "An average adult body is 50 to 65 percent water -- that's roughly 45 quarts. Men are more watery than women. A man's body is 60 to 65 percent water, compared to 50 to 60 percent for a woman"
4. Female Body Fat Percentages: Essential Body Fat: 10%-13% Athletes/Body Builders: 14%-18% Healthy Average Female: 19%-27% Borderline: 28%-31% Overfat: 32% plus Obese: 38% plus Male Body Fat Percentages: Essential Body Fat: 2%-5% Athletes/Body Builders: 6%-10% Healthy Average Male: 11%-19% Borderline: 20%-23% Overfat: 24% plus Obese: 30% plus HTH : )