Theres a lot of things that can bring back our life times to the standard 700 years but most will never be in an environment to utilise the majority of them, you'd have to be utterly isolated from all the modern emf and chemtrail crap, best you can probably do is about 200-250. But it's not just connected to food and vibrational practices you have to understand why and how dna is written. For the most part our dna changes every second based on your daily vibration which is connected to your overall vibration however it's also written with a reference to it's history and the base code. ie scars, the traumas most obvious...we never clear them from our minds so we carry the imprint of them most of our lives. It requires utterly living in the moment and not carrying any energies of a negative kind, including emotional and mental.
You could jump time lines to clear those and remove problems which build up and build up.
Then there is the base code, we rewrite over the same code
The actual code base of the physical body utilised thoughis carried in the akosh.
In order to rewrite it, ie choose in every moment to be the highest potential of your genetic possibilities would require control of that akoshic bridge.
To simplify.
Every version of you already exists in the timelessness that is held on the other side of the veil, so in one timeline or another your lungs would be the lungs of someone like wimhof, or a fire fighter, or olympic swimmer. You just have to write your base code to match those lungs instead of the lungs you have now...and likewise with all the other parts of the body.
This is the only way to avoid the telemere problem.
Telemeres only get shorter because the code is copied over and over, and like and a photocopy, the millionth iteration is gonna be shit.
When you write the code fresh though, the limit of lifespan becomes one only of daily vibration and the environment, general vibration covering what density you're existing in.
I am fairly sure but not 100% that the standard 700 year life span only refers to the 3rd and possibly 4th density of consciousness. As you go up in consciousness, abilities and beliefs the life span should expand out from there.