The Ben Ish-Hai, R. Yosef Hayyim ben Eliyahu, age 26.

Text reads, "Picture of the great, the mighty, the famous, in his valuable writings, in the unseen and in the seen, leader of the Diaspora of Babylon (Iraq), the teacher, Rabbi Yosef Hayyim, of righteous and holy memory for a blessing, son of the teacher, Rabbi Eliyahu, son of the teacher, Rabbi Moshe Hayyim, of righteous and holy memory for a blessing. Born in Baghdad on the 27th of Av 5594 (1st of September 1834), and rose to the holiness of Heaven (died) on the 13th of Elul 5669 (30th August 1909), may his merit be upon us, amen. Pictured in the 26th year of his life." 

Source: Wikimedia Commons