The Bible is the bases for a lot of what you will hear from the Mullahs. Hadith from this source and not the word of the Messenger have been described for centuries as the ‘israeli hadith’. But even from this book we get a clear picture of how old Ishmael was:-
Genesis16:16 And Abram was fourscore and six years old, when Hagar bare Ishmael to Abram. [fourscore= 4x20=80, therefore Abraham was 86years old when Ishmael was born].
Genesis21:5 And Abraham was an hundred years old, when his son Isaac was born unto him.
Therefore Ishmael was 14 years old when Isaac was born.
Now the hadith based absurdities, sorry, Bible absurdities:-
Genesis 21:14 And Abraham rose up early in the morning, and took bread, and a bottle of water, and gave it unto Hagar, putting it on her shoulder, and the child, and sent her away: and she departed, and wandered in the wilderness of Beersheba.
21:15 And the water was spent in the bottle, and she cast the child under one of the shrubs.
21:16 And she went, and sat her down over against him a good way off, as it were a bow shot: for she said, Let me not see the death of the child. And she sat over against him, and lift up her voice, and wept.
21:17 And God heard the voice of the lad; and the angel of God called to Hagar out of heaven, and said unto her, What aileth thee, Hagar? fear not; for God hath heard the voice of the lad where he is.
21:18 Arise, lift up the lad, and hold him in thine hand; for I will make him a great nation.
21:19 And God opened her eyes, and she saw a well of water; and she went, and filled the bottle with water, and gave the lad drink.
Hagar threw Ishmael to the ground, a 14 year old! My son could have thrown me to the ground at 14, he could have carried his mother [if she was not overweight! Oops], so the idea of a baby is just another Bible contradiction; a contradiction the Mullahs have copied to confuse the unwary and those who are ‘ummi’ of the Quran and common sense.