What Ibn Jarir says must be based on assumption...
What Ibn Jarir says must be based on assumption, for he says on the same page that “In 53 A.H./673 A.D., Mu’awiyah appointed ‘Ubaydullah Ibn Ziyad, who was twenty-five years old, as the wali of Khurasan.” This would put his date of birth in 53 A.H./673 A.D. and his age during the Battle of Taff as thirty-two years. His statement agrees with what is stated by Ibn Kathir who, on p. 283, Vol.
8, of his book Al-Bidaya, quotes al-Fadl Ibn Rakin Ibn ‘Ubaydullah saying that [‘Ubaydullah] Ibn Ziyad was twenty-eight years old when al-Husayn (‘a) was killed.” Based on this statement, his year of birth must have been 32 A.H./653 A.D. and that of his death at the age of twenty-one must have been 53 A.H./673 A.D. On p.
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