title: Mohamed Atta
context: Mohamed Mohamed el-Amir Awad el-Sayed Atta (/ˈætɑː/ AT-ah; Arabic: محمد محمد الأمير عوض السيد عطا‎ Muḥammad Muḥammad al-Amir 'Awaḍ as-Sayyid 'Aṭā [mæˈħæmmæd elʔæˈmiːɾ ˈʕɑwɑdˤ esˈsæj.jed ˈʕɑtˤɑ]; September 1, 1968 – September 11, 2001) was an Egyptian hijacker and one of the ringleaders of the September 11 attacks in which four United States commercial aircraft were commandeered with the intention of destroying specific civilian targets. He served as the hijacker-pilot of American Airlines Flight 11 and crashed the plane into the North Tower of the World Trade Center as part of the coordinated attacks.[1][2][3][4][5] At 33 years of age, he was the oldest of the 19 hijackers who took part in the attacks.
question: How old was Mohamed Mohamed el-Amir Awad el-Sayed Atta at the time of the September 11 attacks?
answers: 33