[Luker88]

Deuteronomy 22:28‑29, "young woman...of tender age". For Jewish tradition this means 12 year old, age at which the Jews once considered girls capable of marriage.

Lot daughters are also believed to be less than 15.

Famously also the prophet Mohammed consumed a marriage with a 9 year old, and that was seen as normal and approved by all previous text and tradition.

No age is ever explicitly defined for any case, because "csam" and "underage sex" just were not concepts people gave thought to.

Recognizing that some cases are probably fine by today's standard is fine, but refusing to recognize that at least some of them must have been way too young is ignoring a lot of evidence.