Just as an aside, aren't there some biblical scholars who point out that when ages given in the bible seem odd, such as Methuselah's age, it's likely to be a transliteration error, since early nomadic peoples like the ancient Hebrews more commonly used lunar age, as in months, to describe time passage, rather than annual markers? If that is the case for the story of Isaac, he would have been a three year old. Which makes the story a lot more angst-y.