Maybe I got it wrong: I thought it meant how long the coins have been sitting around, but maybe it means how long the transaction has been sitting unmined to make sure no transaction is left behind?
But it seems I'm on the right track, in that input_age was a measure of how many confirmations, which suggests it's about how long it's been since the last time they were moved:
https://en.bitcoin.it/wiki/Miner_fees#Priority_transactions
Maybe I got it wrong: I thought it meant how long the coins have been sitting around, but maybe it means how long the transaction has been sitting unmined to make sure no transaction is left behind?
But it seems I'm on the right track, in that input_age was a measure of how many confirmations, which suggests it's about how long it's been since the last time they were moved:
note1 here: https://bitcoin.stackexchange.com/questions/95407/what-were-...