Hz. Mahdi (as) will have wide shoulders, his bone configuration will be youthful

(Bihar V.13 p. 8,9,10,11,109,110,112,115,118,119,125,167 and Yanabi' al-Mawadda V. 3 p. 407 and Isbat al-Hudat V. 3 p. 593 and Nahj al-Balaghah (Ibn Abil Hadid) V. 1 p. 281, 282 and an-Najmu al Saqib V. 1 p. 279 and Al-Fusul al-Muhimmah p. 289-90 and Alam al-Wari V. 2 p. 294 and Umdat Uyun Sahib al-Akhbar V. 2 p. 499 and Mu’jam al-Malahim Wa Al-Fitan V. 1 p. 203-14 and V. 3 p. 76-80)