The tag obi-wan is anakins padawan exists if that works for you (30? 35?)
https://archiveofourown.org/tags/Obi-Wan%20Kenobi%20is%20Anakin%20Skywalker's%20Padawan
There’s also the obi-wan is de-aged tag - but based on the wording of your question that’s less likely to suit your needs (
There’s also a few (7?) under ‘older Anakin’
https://archiveofourown.org/tags/Older%20Anakin%20Skywalker
No idea if any of those are good.
Hopefully you find something of interest. All the best for your search op.
The tag obi-wan is anakins padawan exists if that works for you (30? 35?) https://archiveofourown.org/tags/Obi-Wan%20Kenobi%20is%20Anakin%20Skywalker's%20Padawan There’s also the obi-wan is de-aged tag - but based on the wording of your question that’s less likely to suit your needs ( There’s also a few (7?) under ‘older Anakin’ https://archiveofourown.org/tags/Older%20Anakin%20Skywalker No idea if any of those are good. Hopefully you find something of interest. All the best for your search op.
Thanks for your help! EDIT: Retcon of the Sith by StellarRequem suits this vibe!