Bereshis 11:10

10 These are the toldot of Shem: Shem was a hundred years old, and fathered Arpachshad two years after the mabbul;

Bereshis 11:10 Meaning and Commentary

Genesis 11:10

These are the generations of Shem
Or a genealogy of the posterity of Shem; not of all of them, only of those of the line which led to Abraham, by which might appear the true line in which the Messiah from Adam through Abraham sprung:

Shem was one hundred years old, and begat Arphexad two years after
the flood;
by which it is pretty plain that he was younger than Japheth; (See Gill on Genesis 10:21) of Arphaxad his son, (See Gill on Genesis 10:22).

Bereshis 11:10 In-Context

8 So Hashem scattered them abroad from there upon the face of kol Ha’Aretz; and they left off building the Ir.

9 Therefore is the shem of it called Babel; because Hashem did there confuse the language of kol Ha’Aretz; and from there did Hashem scatter them abroad upon the face of kol Ha’Aretz.

10 These are the toldot of Shem: Shem was a hundred years old, and fathered Arpachshad two years after the mabbul;

11 And Shem lived after he fathered Arpachshad five hundred shanah, and fathered banim and banot.

12 And Arpachshad lived five and thirty shanah, and fathered Salah;