Creative commons is irrevocable and perpetual.

> Subject to the terms and conditions of this Public License, the Licensor hereby grants You a worldwide, royalty-free, non-sublicensable, non-exclusive, irrevocable license to exercise the Licensed Rights in the Licensed Material to: [...]

And as for the term:

> This Public License applies for the term of the Copyright and Similar Rights licensed here.

Meaning, the CC license ends when the work becomes public domain. Which is a more correct way of saying it's perpetual.

https://creativecommons.org/licenses/by/4.0/legalcode (same for the other variants)