“Tosfos says that the Seder Olam says that she was three. Tosfos actually goes ahead and says that it can’t even be a mistake in the text since the whole conversation there is explaining how we get age. He only says that there are other Midrashim that argue.”
Not just other midrashim, other texts of Seder Olam that differ.
“I don’t understand how you can say about something that Rashi brings and accepts, that it doesn’t make sense on the basis of your “advanced” moral standards. If only you would have been around in Rashi’s day you coulda taught him a thing or two. “
I don’t argue based on advanced moral standards; I simply point out other texts and other rishonim who disagree. I am not of the stature to argue with a rishon! But we know in at least one case that he had a defective text of the Torah, there are many examples where he had a different text of the Talmud than we have today, and there are manuscripts of Seder Olam Rabbah that say 14 years.