Hazrat Ibrahīm (a.s.) was one hundred and twelve years and according to another report one hundred and twenty years. His respected wife Hazrat Sarah was ninety-seven years. They did not have any children. Allah (S.w.T.) sent to them an Angel to inform them that they would be gifted with a son.
“And his wife was standing (by), so she laughed, then We gave her the good news of Ishaq and after Ishaq of (a son’s son) Yaqub.”
“She said: O wonder! Shall I bear a son when I am an extremely old woman and this my husband an extremely old man? Most surely this is a wonderful thing.”
“They said: Do you wonder at Allah’s bidding? The Mercy of Allah and His blessings are on you, O People of the house, surely He is Praised, Glorious.” (Surah Hūd 11: 71-73)
In brief, the Mercy of Allah (S.w.T.) blessed Hazrat Ibrahīm (a.s.) and Janabe Sarah with a son, Ishaq, at an age when it could never have been expected.