楼主广征博引，穷源溯流，体大思精，当知英国半个世纪前就曾“为天下先”，立法规定“同性恋年龄”吧？

Sexual Offences Act 1967

1.- (1), Notwithstanding any statutory or common law provision, but subject to the provisions of the next following section, a homosexual act in private shall not be an offence provided that the parties consent thereto and have attained the age of twenty-one years. (Amendment to law relating to homosexual acts in private)

 

尽管这既没被人当作“世界的福音“，也没成为”在社会建设方面为天下式的开端“