Genesis 11:10

10 This is the account of Shem and his descendants. Two years after the flood when Shem was 100 years old, he became the father of Arpachshad.

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 all over the face of the earth, and they stopped building the city.

9 This is why it was named Babel, because there the LORD turned the language of the whole earth into babble. From that place the LORD scattered them all over the face of the earth.

10 This is the account of Shem and his descendants. Two years after the flood when Shem was 100 years old, he became the father of Arpachshad.

11 After he became the father of Arpachshad, Shem lived 500 years and had other sons and daughters.

12 Arpachshad was 35 years old when he became the father of Shelah.