The book of Genesis stated that human lifespans used to be much longer. Methuselah was stated to have lived the longest lifespan and possibly could have lived longer had it not been for the Flood where Noah's family survived in the Ark.
Pre-Flood lineage: Adam > Seth > Enosh > Kenan > Mahalalel > Jared > Enoch > Methuselah
Genesis 5:22-27:
21. When Enoch had lived 65 years, he became the father of Methuselah.
22. And after he became the father of Methuselah, Enoch walked with God 300 years and had other sons and daughters.
23. Altogether, Enoch lived 365 years.
24. Enoch walked with God; then he was no more, because God took him away.
25. When Methuselah had lived 187 years, he became the father of Lamech.
26. And after he became the father of Lamech, Methuselah lived 782 years and had other sons and daughters.
27. Altogether, Methuselah lived 969 years, and then he died.
Methuselah also appeared in 1 Chronicles 1:3.
Because Genesis listed the ages of his ancestors, we can actually deduce the time from Creation to the death of Methuselah.
Genesis 5:3: When Adam had lived 130 years, he had a son in his own likeness, in his own image; and he named him Seth.
Genesis 5:6: When Seth had lived 105 years, he became the father of Enosh.
Genesis 5:9. When Enosh had lived 90 years, he became the father of Kenan.
Genesis 5:12. When Kenan had lived 70 years, he became the father of Mahalalel.
Genesis 5:15. When Mahalalel had lived 65 years, he became the father of Jared.
Genesis 5:18. When Jared had lived 162 years, he became the father of Enoch.
Genesis 5:21. When Enoch had lived 65 years, he became the father of Methuselah.
130 + 105 + 90 + 70 + 65 + 162 + 65 + 969 = 1656 years from Creation to the death of Methuselah.
