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I also don't have access to that private key anymore anyway, but I'm still using the same email address.

What is indeed missing is a limited validity period of the key, as a certificate would provide. Then everybody would be clear on how long the key can be used.

OpenPGP Keys do have expiration dates/validity periods: https://datatracker.ietf.org/doc/html/rfc4880#section-5.2.3....

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