AC/DC singer Brian Johnson reveals in a new interview he's surprised the band has lasted this long. 

Sixty three year old Johnson told Billboard the band's longevity is surprising to both he and his band mates and they don't know what they're doing that they are able to sustain their success. He admits that they are giving 100 percent every night at every show on every tour.

Their new DVD Live at River Plate proves that they give their all. It's awesome. If you're an AC/DC fan and you don't own this, you're a jackwagon.

Brian's new book, Rockers and Rollers: A Full Throttle Memoir is on news stands now.