At what age did ʻAli, may Allaah be pleased with him, and Faatimah, may Allaah be pleased with her, marry?

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 is His Slave and Messenger.

It was stated in As-Seerah Al-Halabiyyah that ʻAli was twenty-one years old when he married Faatimah and that she was fifteen years old.

Allaah knows best.