When should a boy be forbidden from being alone with an Ajnabiyyah (woman lawful for a man to marry) or is he allowed to do so until he reaches puberty?
A boy is forbidden from that after reaching puberty. However, if there is a possibility of any desire or Fitnah (temptation) on his or her part, he must be forbidden to visit her or be in Khulwah (being alone with a member of the opposite sex) with her to avoid any Fitnah. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.