When he was 30 years old, he had a son named Reu. He lived for another 209 years and had other sons and daughters. His total life span was thus 239 years, slightly more than half that of his father and the shortest life span to date in his line.
The name Peleg means "division," and Genesis 10:25 states that "in his time the earth was divided." Georgius Syncellus, as quoted by Ussher, states that the Tower of Babel was built and then abandoned when Peleg was five years old. Some also speculate that in Peleg's time the earth was mapped, or even that some sort of tectonic activity had occurred in that period.