17%-18% is definitely athelete range of body fat. From all the reading I have done-women should be between 22-25 or 26%. The ranges also change as we age. I found this, for example:

Age Women Men

18-39 years 21-32 percent 8-19 percent
40-59 years 23-33 percent 11-21 percent
60-79 years 24-35 percent 13-24 percent