Now and then: '60s and '70s rockers

POSTED: 11:21 PM PDT Sep 22, 2011    UPDATED: 11:00 PM PDT Apr 12, 2016 
Joan Baez, Bob Dylan, 1963 March on Washington

With Bob Dylan turning 75 on Tuesday, click on to see how the music icon and other rockers from the 1960s and 1970s have aged over the years.