Yasser Al-Dawsari Memorized the Quran by Age 15

Just stumbled on this: Yasser Al-Dawsari became a hafiz at 15, subhanAllah. He’s one of the main imams at Masjid Al Haram, if I’m right. I’m a new Muslim and didn’t grow up with Islam, so is this really unusual? I can’t picture 15-year-old me memorizing even one surah, let alone all 114. May Allah bless him, it’s truly amazing.