As much as I'm interested in the concept of the novel [a cure for aging and its effects on the world], I DO NOT CARE AT ALL about the adventures of the protagonist, a straight, cis, white, middle-class, able-bodied, US man with a societally acceptable body shape and a slag heap of unexamined privilege.

Seemingly THE ENTIRE WORLD revolves around the adventures of straight, cis, white, middle-class, able-bodied men with societally acceptable body shapes and slag heaps of unexamined privilege. They're tedious, boring, self-indulgent and overdone. Find a new narrative, people.

P.S. And if you're a straight etc. man whose protagonist happens to be a straight etc. man, you're suffering A FAILURE OF IMAGINATION. The world don't look like you no more. Get over yourself.