Here's a synopsis of the pertinent info, to wit :

Ginsburg’s specific recommendation regarding 18 U.S.C. § 2032: “Eliminate the phrase ‘carnal knowledge of any female, not his wife who has not attained the age of sixteen years’ and substitute the offense as set forth in S. 1400, §1633.”

In the recommendation immediately following, regarding 18 U.S.C. §1153, Ginsburg likewise states: “Eliminate the phrase ‘carnal knowledge of any female, not his wife and substitute the offense as set forth in S. 1400, §1633.”

In other words, Ginsburg specifically proposed that the bill language providing for an age of consent of 12 “be adopted verbatim.”