Men: 20-40 yrs old: Underfat: under 8 percent, Healthy: 8-19 percent, Overweight: 19-25 percent, Obese: over 25 percent. 41-60 yrs old: Underfat: under 11 percent, Healthy: 11-22 percent, Overweight: 22-27 percent, Obese: over 27 percent.