Matter of VFD, 23 I. & N. Dec. 859 (BIA 2006) (victim of sexual abuse who is under the age of 18 is a "minor" for purposes of determining whether a noncitizen has been convicted of sexual abuse of a minor within the meaning of INA 101(a)(43)(A), 8 U.S.C. 1101(a)(43)(A)).
http://www.usdoj.gov/eoir/vll/intdec/vol23/3523.pdf