but, as to the underlying social arrangement of young girls going through phases with older men? i think there's something inherently normal about it, and the reality of agency in a lot of these scenarios really shouldn't be discounted. there's a blurry point where it needs to be illegal - 14, 15, 16. but, the law should really be adjusted so that young girls are able to easily extract themselves from these scenarios once they grow out of them, not to trap them into common-law legal arrangements.
but, the basic idea of legally marrying underage girls off by state dictate is insane - and apparently happening quite frequently.