All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and messenger.
According to the Hanafi, Shaafi‘i and Hanbali scholars, it is permissible that a boy who is able to discern but has not yet reached the age of puberty calls the Athaan. This is the correct opinion. Its proof is that ‘Abdullaah ibn Abi Bakr ibn Anas ibn Maalik used to call the Athaan while he had not yet reached the age of puberty. This occurred without any denial from his grandfather, Anas ibn Maalik or anyone else. Ibn Qudaamah said: “This was a very well known matter and was not denied by anyone and thus it is considered consensus.”
The Maaliki scholars viewed that the Athaan cannot be called by a discerning boy unless he depends upon the aid of a mature person regarding determining the time and the way the Athaan is called.
There is absolutely no doubt that it is better to have a regular Mu’aththin and Imaam in every mosque. However, if neither of them are present, then there is no problem that any Muslim of those who are free from impediments set by Sharee‘ah calls the Athaan.
Accordingly, there is no harm in what the questioner asked, while it is better that every mosque should have a regular Mu‘aththin who meets the conditions required of the Mu’athin. We have to draw attention to an important matter which is the opinion of the Maaliki scholars in this question. Although those who adopt it are few from among other scholars, it should be taken into careful consideration. This is because people depend on the Athaan of the Mu’aththin in observing fasting and prayer, so it should not be assigned to someone who has not reached the age of puberty.