$0 because the concept of currency did not yet exist.

Bout tree fiddy.

Probably not as much as you'd think. The Gold Standard has not been repealed until 1971, which means inflation would only happen due to extraordinary events (like big wars). But the inflation since 1971 would still multiply your money eight-fold, which will put your saving of 82 millennia above Elon Musk's net worth.

The returns on iron in that era would have been astronomical. But if you put all your money into a mastodon-powered ploughing business you could be belly up

You forgot that you could account for inflation yourself, IT'S TRUE