1- According to this hadith Abraham was circumcised in the age of 80.
Abu Hurayra reported that:
the Messenger of Allah, may Allah bless him and grant him peace, said, “Ibrahim, may Allah bless him and grant him peace, was circumcised when he was eighty years old. He was circumcised with an axe (qadum).”
Book 1, Hadith 1244
2- According to the Bible Abraham was circumcised in the age of 99.
New International Version (NIV)
The Covenant of Circumcision
1 When Abram was ninety-nine years old, the Lord appeared to him and said, “I am God Almighty[a]; walk before me faithfully and be blameless.
2 Then I will make my covenant between me and you and will greatly increase your numbers.”
3 Abram fell facedown, and God said to him,
4 “As for me, this is my covenant with you: You will be the father of many nations.
5 No longer will you be called Abram[b]; your name will be Abraham,[c] for I have made you a father of many nations.
6 I will make you very fruitful; I will make nations of you, and kings will come from you.
7 I will establish my covenant as an everlasting covenant between me and you and your descendants after you for the generations to come, to be your God and the God of your descendants after you.
8 The whole land of Canaan, where you now reside as a foreigner, I will give as an everlasting possession to you and your descendants after you; and I will be their God.”
9 Then God said to Abraham, “As for you, you must keep my covenant, you and your descendants after you for the generations to come.
10 This is my covenant with you and your descendants after you, the covenant you are to keep: Every male among you shall be circumcised.
11 You are to undergo circumcision, and it will be the sign of the covenant between me and you.
12 For the generations to come every male among you who is eight days old must be circumcised, including those born in your household or bought with money from a foreigner—those who are not your offspring.
13 Whether born in your household or bought with your money, they must be circumcised. My covenant in your flesh is to be an everlasting covenant.
14 Any uncircumcised male, who has not been circumcised in the flesh, will be cut off from his people; he has broken my covenant.”