Lifespan 1000 years to 80?

[Gawdzilla]

And this tells us that the length of a year was?

Well, astrologers certainly could.

Boru

And knowing what a year was had great importance to agrarian societies, planting and harvesting times came around regularly, on a yearly cycle. Trying to get the OT to make even the least sense by magicking up a different way of counting years is silly.