I still don't understand this post. Was it large chunks moved hence 'days destroyed' or was it many small amounts?
"So a high number of bitcoin days destroyed means that either old coins that haven't moved for a long time are moving, or that someone with a large number of bitcoins are spending them (or both)."
In this case you can actually tell that it's old coins.
The total output volume yesterday was about 1 million BTC, which is below the recent average. The days destroyed were about 134 million, which is WAY above average. Therefore you can assume that most of the coins transacted were "regular" young coins, but some of them were very very old.
To back this up, blockchain.info has a feature that filters days destoryed by coin age. If you filter with a minimum of 1 year, those transactions account for 131 million out of 134 million total days destroyed yesterday. Since most of the coins moved on an average day are just a few days old, this further suggests that a significant amount of coins more than 1 year old were moved.
Assuming no more than 100,000 old coins are involved (probably much less), they would have to be at least 3.5 years old. So it seems likely that a very big miner from 2009/2010 just moved a lot of coins for the first time since mining them.
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