Bible Quiz The Bible Quiz - How old was Avraham (Abraham) when Yitzchak (Isaac) was born? Topic Q 241 Question 1 of 1 Vayeira Score of 60 How old was Avraham (Abraham) when Yitzchak (Isaac) was born? 100 years old 86 years old 99 years old 120 years old Menu Click For Source Bereishit 21:5 96 people have so far answered this question That is correct31.3% of people got this wrong. That is not correctOnly 68.8% of people got it right.