What do you mean by old? For example, block number 9:
https://mempool.space/block/000000008d9dc510f23c2657fc4f67bea30078cc05a90eb89e84cc475c080805
Discussion
Hehe, good point! I skipped to think of empty blocks and blocks with one or just a few transactions... :D
So I make it more precise with a threshold size:
Is there a bitcoin block with min. 100 transactions, from which all transactions have been spent already?
That's a good challenge. 😎 Hold my beer! 🍺
So, what do you think about block number 51729 with 628 txs? https://mempool.space/block/000000001786abd75dc912d8eabe85080c7e822858d445644fa3a3e059c2033b
Hmm, could be! I'd had to write some code to check it...
(maybe a good use case for libkernel)