Ive read Art Scroll Biographies and regular biographies and the art scroll are not written in the same way. There may be historical license as opposed to fact with them.
Pretty much all say the same………..
At 3 years old when everyone else was learning Alef Bais, the Gadol had already finished Chumash
At 10 years old everyone saw the Gadol was an Iluy and he finished SHAS for the first times
At 13 years old the Rosh Yehsiva gave the gadol Semicha and learned Chavursa with him and at 18, the Rosh Yeshiva gave the gadol his daughter for marriage.