Once the Prophet ﷺ came to me while a man was in my house. He said, "O ʿAisha! Who is this (man)?" I replied, "My foster brothers" He said, "O ʿAisha! Be sure about your foster brothers, as fostership is only valid if it takes place in the suckling period (before two years of age).  

دَخَلَ عَلَىَّ النَّبِيُّ ﷺ وَعِنْدِي رَجُلٌ قَالَ يَا عَائِشَةُ مَنْ هَذَا قُلْتُ أَخِي مِنَ الرَّضَاعَةِ قَالَ يَا عَائِشَةُ انْظُرْنَ مَنْ إِخْوَانُكُنَّ فَإِنَّمَا الرَّضَاعَةُ مِنَ الْمَجَاعَةِ