Lifespan 1000 years to 80?

[TubbyTubby]

And Methuselah lived an hundred eighty and seven years (moons), and begat Lamech. And Methuselah lived after he begat Lamech seven hundred eighty and two years (moons), and begat sons and daughters: And all the days of Methuselah were nine hundred sixty and nine years (moons): and he died." - Genesis 5:25-27

187/12.36=15.13

969/12.36=78.4

What? So Nahor was dead by the age of 12 (147) yet had 8 kids!