A man was entrusted by a group

A: Anyone who is unable to throw the pebbles, may authorize someone to throw on their behalf and this ruling applies to Jamarat-ul-`Aqabah and others. They may authorize a trustworthy person who is performing Hajj at the same year. There is no harm for the young women mentioned in the question to authorize someone to do that on their behalf in order to secure them from the crowdedness. There is no harm for them to throw Jamarat-ul-`Aqabah on the 9th day of Dhul-Hijjah and before sunrise of `Eid-ul-Adha because the Prophet (peace be upon him) gave permission for anyone who is weak to do that.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.