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.
I doubt much experimentation could be done on land under most governments of the world. That's why I see seasteading as a necessary step between here and there.
There are several promising technologies, no magic bullet but it may be a combination of several things. Likely tailored to the individual.
I don't follow it close enough to know the tech (yet) but I believe it will be something available to only the super rich early on (like most new tech), so part of my hodl strategy involves saving for that tech instead of blowing it on lambos now.
Recently I have been given a peek into just how much Bitcoin will benefit the world. The early adopters of Bitcoin are the same ones that believe in this tech and the reason behind it. They are now very rich and have different dreams than the rich that came before us. Very interesting times ahead.