21 When Enoch had lived 65 years, he became the father of Methuselah. 22 After he became the father of Methuselah, Enoch walked faithfully with God 300 years and had other sons and daughters.
Genesis 5:22
ESV - 22 Enoch walked with God after he fathered Methuselah 300 years and had other sons and daughters.
For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.
"The wages of sin...death" progressively decreased human longevity until 70 or 80 became the norm (Genesis 6:3; Ps 90:10).