There are no known life extension technologies (so far).
The most promising tech currently would be senolytics, but preliminary data show that the result would be longer "healthspan", but not an extended lifespan.
Eventually, we might be able to upload ourself into some substrate, but it might not be characterized as a life extension, but some kind of "presence", perhaps.
I am not sure that this would even be desirable from an uploadee perspective.
I can see that it could be good for relatives for 'closure', perhaps.