Allah Almighty, and He is the most truthful of all who speak, said: "Or (before) the children who are not yet aware of the private matters of women." [Surah al-Nur: 31]
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / Q13551
It is narrated from Jabir (may Allah be pleased with him) that Umm Salamah (may Allah be pleased with her) sought permission from the Prophet (peace and blessings be upon him) for cupping, so the Prophet (peace and blessings be upon him) ordered Abu Taybah to cup her. Jabir (may Allah be pleased with him) said: I think Abu Taybah was either her foster brother or a boy who had not yet reached puberty.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 13552