There are very powerful forces that are unleashed when you perform the Nirampetian and Odikamuyyan rituals. So, for that reason you should be a very mature Aaiyyanist to take part in such rituals. You cannot be young. In this regard it is best if you perform these rituals if you are over the age of 25. This sacred knowledge must not be shared with anyone under that age. Remember when you perform these rituals you become resonant with the Nirampetian Tala and Odikamuyyan Loka space. Having a young person being exposed to the ancient Gods and Demons would render their spiritual essence and this will affect their physical aspect too. If you disrupt the spiritual you will disrupt the physical. Also if the physical is too young then it also manifests in the spiritual being weak - unless you have been brought up as an Aaiyyanist for at least 18 years.
Also, if you are a young person who becomes resonant with the Nirampetian Tala space, you will be linked with all Talas and all entities will try to become one with you and perhaps take you over. Also if you opened the Odikamuyyan Loka, you will be blinded by the positive power of the Gods. This has been shown throughout time when young people interact with Gods - they are spiritually and physically blinded. You will basically be too immature to converse with the Asuras or the Devas. It will literally drive you insane, and thus this knowledge has been severely restricted as it is too dangerous for the average non-Dravidian Aaiyyan to consume.
However, in some circles of the Aaiyyan World Foundation it has been known that the only non-Dravidian speakers who are linking to this knowledge are people who were Dravidian Aaiyyanists in their previous incarnations, or people who are close to this knowledge from different disciplines. Thus if you are reading this book you were a Dravidian Aaiyyanist in a previous life and thus will be able to handle the power of the Talas and Lokas. In fact you will be used to this power and by reading and inscribing the Yantras it will awaken that which was dormant in you... your power will be fully realized.
So, in summary - the power of the Yantras (and the respective Lokas and Talas it opens) is very great, thus the age of the participants taking part in the ritual must be strictly over the age of 25.