Once you accept that there is something which experiences qualia that raises the question of whether that something has other attributes that we can also investigate. Investigating that question isn't easy but I don't think that just because it's a hard question one should shun that question.

To get back to Thomas Hanna, he is a quite interesting character. He was chairman of the Department of Philosophy at the University of Florida. Then he went more practical and in the applied teaching of somatics and makes some pretty big claims about how it can make people healthy and eliminate most of the diseases of aging only to die at the age of 61 in a car crash.

I read him because buybuydandavis recommened him on LW. One of the claims is that people often suffer from what he calls sensor-motor amnesia whereby people forget how to use and relax certain muscles in their body and that leads to medical problems. According to him that sensor-motor amnesia is healable. Sensor-motor amnesia would be one aspect of aging that Aubrey de Grey missed in his list.

Hanna attributes 50% of all illness towards problems arising from sensor-motor amnesia which is a pretty big claim. Even if it's less than 50% identifying a part of aging that we can actually do something about seems very important. Bonus points are that a book like that gives you a better grasp on consciousness and related concepts.