In a brand new interview with TheMorningSun.com, AC/DC singer Brian Johnson spoke about the possibility of the band's current "Rock Or Bust" world tour being the group's last hurrah.
"Y'know, retirement is like anything," Johnson said. "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."
He continued: "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. 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."
AC/DC's sixteenth studio album, "Rock Or Bust", has sold around 545,000 copies since debuting at No. 3 on the Billboard album chart back in December.
It's the band's first album without founding guitarist Malcolm Young, who is suffering from dementia. He has been replaced by nephew Stevie Young.
AC/DC drummer Phil Rudd was arrested last November at his home in Tauranga on charges of threatening to kill and possession of methamphetamine and cannabis.
Although Rudd played on "Rock Or Bust", he did not appear in photos or videos for the disc.
One-time AC/DC drummer Chris Slade officially joined the band's lineup for its performance on the February 8 Grammy Awards telecast. Slade is also behind the kit for the group's current world tour.
The band's North American tour will wrap on September 28 at Dodger Stadium in Los Angeles.