Reference for Niddah 90:28

ור"ש בן אלעזר מ"ט

are the rulings of Rabbi. R. Simeon b. Eleazar stated, The age limits that were assigned to the girl apply to the boy while those assigned to the boy apply to the girl.<span class="x" onmousemove="('comment',' The boy, in his opinion, maturing earlier. ');">²⁴</span>

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