Good question, Dan Scott ... it seems that in the future, there will be both your memory (together with your specific brain functionality) and your DNA required to NOT be lost, in order for you to be alive, being reconstructed and brought back to life (like after a good night sleep) anytime you have a big accident, which is destroying the main part of your body, which gives you the conscience of being alive, your brain.
In other words, it will be required to be saved both the info for your "hardware" (DNA), and the info from your brain, the "software", as mentioned above.
At that time, by transferring your "software" into a younger version of your body/brain ("hardware"), you will stay always young ...