AC/DC survived the sudden departure of co-founding member Malcolm Young, but that doesn't mean they haven't considered calling it quits.

“Y’know, retirement is like anything,” Brian Johnson tells the Morning Sun. “A good footballer, a good ice hockey player, they don’t want to retire, but unfortunately sometimes there’s a time when you have to call it quits. So, it’s an ongoing thing with us. We never say no, and we never say never."

That said, the reaction to AC/DC's first post-Malcolm album, last year's hit Rock or Bust, and its resulting tour continues to bolster Johnson.

“The thing about the boys in AC/DC you’ve got to remember is we’re constantly surprised and amazed at how we keep the success going," he said. "We don’t know what we’re doing. I mean, we literally don’t know what we’re doing, except what we’re doing is we just play 100 percent every night and give it everything we’ve got. If that’s the secret of success, we’ll pass it on. But we never expect the crowds. We never take anything for granted. How can you? Times change. You’ve just got to keep doing what you’re doing, basically, and just hope they come back for more.”

Rock or Bust went to No. 1 in more than half a dozen countries, including the U.K., and earned gold certification in the U.S. on the way to a No. 3 finish. AC/DC's celebrated North American tour continues tonight in Detroit.

AC/DC Albums, Ranked Worst to Best