Answered by Mufti Mohammed Tosir Miah
Can women pray Tarawih with Jammah behind a minor boy (Mahram), who is Quran hafiz?
In the Hanafi Fiqh, it is not valid for an adult to pray their obligatory or nafl prayers including the Tarawih Salah behind someone who has not yet reached puberty. Children are not legally responsible, and so any prayers they do pray are counted as nafl prayers, hence an adult who is praying a fardh prayer cannot follow an imam who is praying nafl prayers. (Hidayah p.124 v.1)
Saaiduna Ibn Abbas reports that, “A boy is not made an Imam until he experiences a wet dream (reaches puberty)” (Sunan Baihaqi)
Only Allah Knows Best
Mohammed Tosir Miah
Darul Ifta Birmingham