Bismillah Walhamdulillah Was Salaatu Was Salaam ‘ala Rasulillah Narrated Aisha (Radi-Allahu ‘anha):
Once the Prophet (Sallallahu ‘Alaihi Wa Sallam) came to me while a man was in my house. He said, “O ‘Aisha! Who is this (man)?” I replied, “My foster brothers” He said, “O ‘Aisha! Be sure about your foster brothers, as fostership is only valid if it takes place in the suckling period (before two years of age).”
Bukhari Vol. 3 : No. 815