“The Ten Thousand” Anabasis, Xenophon’s report of the Greek mercenaries 4th century long fight home.
Different fields require different creative talents and these talents have different burn out rates on an average it seems. The theoretical physicists seem to do their best work at early ages and then just place hold after that period. Some people crank out creative work over a long period.
For some reasons I think of John Ringo’s ” The Last Centurion.” It was inspired by Anabasis but he states that book was written like a long blog and that it didn’t feel like his creation, it seemed to write itself and he was just an instrument. He violated a lot of the things he learned about writing fiction doing it. He said he never writes in first person but for that book he did.