By Denny Dyroff, Entertainment Editor, The Times Fans and journalists make a big deal about the age of some of the singers and musicians who are still performing live – acts such as Jimmy Page, Keith Richards, Roger Daltrey (79), Ray Davies, Rod Stewart, Stephen Stills (78) and Van Morrison, Debbie Harry, Bryan Ferry, Pete Townshend, Eric Clapton (77). However, when it comes to longevity, few can...