Genesis 11:10

10 These are the generations of Shem: Shem was a hundred years old and begot Arphaxad two years after the flood;

Genesis 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).

Genesis 11:10 In-Context

8 So the LORD scattered them abroad from thence upon the face of all the earth; and they left off building the city.

9 Therefore is the name of it called Babel [that is, Confusion], because the LORD did there confound the language of all the earth; and from thence did the LORD scatter them abroad upon the face of all the earth.

10 These are the generations of Shem: Shem was a hundred years old and begot Arphaxad two years after the flood;

11 and Shem lived after he begot Arphaxad five hundred years, and begot sons and daughters.

12 And Arphaxad lived five and thirty years and begot Salah;