King Kamala
Integral Poster
Each episode will last one hour, and focus on a single issue that is "currently part of the national conversation and [Stewart's] advocacy work". Apple has said that the show will run for multiple seasons, and each season will be accompanied by a companion podcast.
This reads like Jon Stewart seeing popularity of Last Week Tonight and being like "Eh. I blew it by retiring too early."
(also I don't think he looks THAT much older than he did when he left TDS. Certainly not enough to base advertising campaign of his new show around "LOL! I'm OLD now!")