I also reread Conan a year or two ago (complete Robert E. Howard on the Kindle, cheap) and it did hold up well. A few years back, I reread two Tarzan books, and sadly, they did not. Same with Doc Savage.
I have to admit I loved all of them 50 years ago.
I did as well and still have sixty or so of the Doc Savage books.
I also have fourteen of Walter Gibson’s Shadow stories. Those hold up much better.