Up to now I know that miners choose transactions to be included in a block only based on their related transaction fees.

Does the age (i.e. timestamp) of a transaction play any role in the priority policy adopted by a miner?

Let's say that transaction tx_a has a transaction fee slightly lower than tx_b, but it has been created earlier than tx_b. Is there any chance for tx_a to be mined before tx_b?

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No it doesn't. Until a transaction is mined, it remains in the mempool where it awaits to be picked by a miner either for gas fee or for MEV incentives. The timestamp of when the transaction is signed does not factor into any incentives.

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