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The story of Abraham binding Isaac is told in Gen 22: 1-18. Excerpting from v. 2:

[God] said, “Take your son, your only son Isaac, whom you love....and offer him ... as a burnt offering..." (ESV)
... וַיֹּ֡אמֶר קַח־נָ֠א אֶת־בִּנְךָ֙ אֶת־יְחִֽידְךָ֤ אֲשֶׁר־אָהַ֨בְתָּ֙ אֶת־יִצְחָ֔ק …. וְהַעֲלֵ֤הוּ ... לְעֹלָ֔ה (BHS)

The midrash Genesis Rabbah states that Isaac was 37 (or 26?) years old at the time.* I had always assumed he was what we might call a "child," but I don't know why. Abraham refers to him as both בְּנִ֑י ("my son") and הַנַּ֔עַר (v. 5; ESV, "the boy"; LXX, τὸ παιδάριον). I would imagine that בֵּן ("son") can be used to refer to a person of any age, but I'm not sure if נַ֫עַר denotes any particular age range.

The beginning of the story also doesn't give me a lot of insight into its timing in the life of Isaac:
וַיְהִ֗י אַחַר֙ הַדְּבָרִ֣ים הָאֵ֔לֶּה ("After these things..."). It's unclear how long "after" or exactly what "these things" refers to.

Is there anything in the text to help us figure out how old Isaac was at the time?

*The reasoning is explained in footnote 5 (p. 497) in that link, but it relies on a tradition not evident in the text to my knowledge.

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@Susan I read the same sources, and came to the same conclusion that Isaac was not a 'young lad' who could be 'overpowered' by Abraham, but a 'young man'(37 is young, if your father is 137). Either way, Isaac was 'willingly bound', in that he trusted his father who said, "G-d will provide a sacrifice", whether or not the sacrifice was himself, or some other. Interestingly, in Mandarin character, part of 'sacrifice' includes 'lamb'. – Tau Jan 12 '15 at 9:37
@Susan Just a comment re: the first thirteen words of Footnote #5 on the p. 497. Sarah was indeed to be 90 years old when she gave birth to Isaac (Gen 17:17), but while that states Sarah was 127 years old at her death, chances are she was only 126. The 127 is her "span of life" (Gen 23:1) that began at her conception. – John Martin Jan 12 '15 at 12:45
Thanks @JohnMartin. The part of that I wasn't sure about was the association of her death with the binding of Isaac.... – Susan Jan 12 '15 at 13:06

Gen 22: 5 calls Isaac, "na'ar" in Hebrew, (English transl. for 'lad')

"From na'ar; (concretely) a boy (as active), from the age of infancy to adolescence; by implication, a servant; also (by interch. Of sex), a girl (of similar latitude in age) -- babe, boy, child, damsel (from the margin), lad, servant, young (man)."

In the writings of Josephus, the age of Issac, at the time of the sacrifice that Abraham prepared to make of him, is said to be twenty-five years old. (Antiquities of the Jews: English (1.13.2), Greek (2.227))

Google Josephus on the Bible, p. 275, Issac as sacrifice. (Josephus would have been writing in retrospect, but may have had access to more information than we have today.)

These two ideas, (together with the Hebrew writings concerning the age of the 'youths' described in the story of Elisha sending bears after 'youths' who were harassing him about Holy things, these men were called youths but understood by scholars commentaries to be 20 to 40 year olds,)...the sum of which leads us to assume that Isaac was in his mid twenties early 30's, approximately.

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Note that your biblehub link there has got the BDB entries (IMO the most valuable part of that page) mixed up for two different meanings for nʿr. You can see the correct BDB entry for the meaning we're discussing here on this page (but the concordance info is correct on the page you originally referenced). – Susan Feb 13 '15 at 4:02
5287-89(maybe more, didn't look) have same Hebrew wrd.., 1.shake/off/shook 2. men/man 3.young man /woman, etc.- it's an unusual word – Hello Feb 13 '15 at 4:26
For fun with that, check out the varying translations of Zechariah 11:16 (the pertinent word is the object of seek / look for). – Susan Feb 13 '15 at 4:40
@Susan- my quote marks and quotation were accurate i think, I took them right out of the place you edited. – Hello Feb 19 '15 at 2:31
Sorry if I changed it in a way you didn’t intend. I was just adding links and noted that "at the time of the Aquedah” is not found in the English linked there. I do appreciate the Josephus reference, though, and have +1’ed this for that reason. – Susan Feb 19 '15 at 3:09

Since Genesis doesn't show how old Abraham's son/boy Isaac was at that time, all we could do to determine that is calculate his age then. However, we would need to have some other information, such as someone else’s age at the time, along with how much older or younger than Isaac that individual was.

Isaac was born to Abraham at 100 years old, Sarah was to be 90, and the step brother, Ishmael, would probably have been 14. We don't know how old they were at the time Isaac was offered up.

We know Isaac got married when he was 40 years old, Isaac’s twin sons Esau and Jacob were born when he was 60, and he died at 180. However, we don't know the differences in time between those events and Isaac being offered up. We know Isaac’s wife Rebekah never has an age given, nor does any other female beyond Sarah.

Other information that won't help includes the “spans of life” of Abraham (175 years), Sarah (127), and Ishmael (137).

With the information in text, we really can't determine how old Isaac was at that time.

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Jewish oral tradition suggests that Isaac was thirty-seven when Abraham offered him on Mount Moriah.

The following summary by Ryle (1921) provides the findings and general conclusions of rabbinic tradition in regard to this very question -

Jewish Tradition found a fertile subject in the ‘aḳêdah, or binding, of Isaac. The following passage from the Targum of Palestine is a good example of Haggadah (i.e. legend, or explanatory tradition): “And they came to the place of which the Lord had told him. And Abraham builded there the altar which Adam had built, which had been destroyed by the waters of the deluge, which Noah had again builded, and which had been destroyed in the age of divisions [i.e. the dispersion of the peoples]. And he set the wood in order upon it, and bound Isaac his son, and laid him on the altar upon the wood. And Abraham stretched out his hand, and took the knife to slay his son. And Isaac answered and said to his father, Bind me properly, lest I tremble from the affliction of my soul, and be cast into the pit of destruction, and there be found profaneness in thy offering. Now the eyes of Abraham looked on the eyes of Isaac; but the eyes of Isaac looked towards the angels on high, and Isaac beheld them, but Abraham saw them not. And the angels answered on high, Come, behold how these solitary ones who are in the world kill the one the other; he who slays delays not; he who is to be slain reacheth forth his neck. And the Angel of the Lord called to him, &c.”
“According to Jose ben Zimra, the idea of tempting Abraham was suggested by Satan who said, ‘Lord of the Universe! Here is a man whom thou hast blessed with a son at the age of one hundred years, and yet, amidst all his feasts, he did not offer thee a single dove or young pigeon for a sacrifice’ (Sanh. 87b; Gen. R. LV.). In Jose ben Zimra’s opinion, the ‘aḳedah took place immediately after Isaac’s weaning. This however is not the general opinion. According to the Rabbis, the ‘aḳedah not only coincided with, but was the cause of the death of Sarah, who was informed of Abraham’s intention while he and Isaac were on the way to Mount Moriah. Therefore Isaac must then have been thirty-seven years old (Seder ‘Olam Rabbah, ed. Ratner, p. 6; Pirke R. El. XXXI.; Tanna debe Eliyahu R. XXVII.).” Jewish Encycl. s.v. Isaac.
“The Jews implore the mercy of God by the sacrifice of Isaac, as Christians by the sacrifice of Christ” (Mayor, Ep. James, p. 97). The merits of Isaac’s submission were regarded as abounding to the credit of the whole race; e.g. “For the merit of Isaac who offered himself upon the altar, the Holy One, blessed be He, will hereafter raise the dead” (Pesikta Rab. Kahana, p. 200, ed. Buber).

Ryle, Herbert E. (1921). The Book of Genesis in the Revised Version with Introduction and Notes. Cambridge: Cambridge University Press, 243-244.

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