UTXO aging refers to the concept of tracking how long unspent transaction outputs (UTXOs) remain unspent in a blockchain. UTXOs represent the outputs of transactions that have not yet been used as inputs in new transactions. As time goes by, the age of these UTXOs increases, which can impact their desirability and usability. Older UTXOs may help users prioritize transactions, as miners often consider the age of UTXOs when selecting which transactions to include in a block. The longer a UTXO stays unspent, the higher its “age.” In cases of high network congestion, users may choose to spend older UTXOs to increase the likelihood of their transactions being confirmed faster, as older coins may be perceived as more priority-worthy. Moreover, UTXO aging can provide insights into network dynamics and user behavior, influencing strategies for transaction timing and fee settings. Understanding this concept can help users navigate transaction efficiency and make informed decisions about when and how to spend their coins.