Very interesting experiment made at Stanford University: blood from a young mouse caused an old mouse to become young again.

https://www.nature.com/news/ageing-r...-blood-1.16762

I'm 100% certain that blood is just a mean in between, although is very important as the experiment reveals. I would conclude that DNA itself is - as some other scientists and researchers already suggested - not as essential to rejuvenation... but is just a program / pattern, and that's all. And that energy is considered in the eastern medicine to be closely related to blood.