Johnson tells Classic Rock magazine, "We were talking about the end of the (current Black Ice) tour and I said, 'We're finishing in May (10) - and that's me done!'

"But Malcolm (Young) said, 'What are you talk in' about? We're not gonna let you retire!'" Johnson admits he does his best to stay in shape for tours, but he's not sure he's got what it takes to carry on. - more on this story