Roger Daltrey, frontman of the Who, has addressed his mortality, weeks after his 80th birthday. The rocker, who hit the milestone on March 1, gave a long self-examination to U.K.’s The Times while explaining his decision to step down as the curator of the annual Teenage Cancer Trust (TCT) charity concerts. “I have to be realistic. I’m on my way out,” the legendary singer wrote. “The average life expectancy is 83 and with a bit of luck I’ll make that, but we need someone else to drive things.” Daltrey further detailed the nervousness he felt before recent shows, admitting concerns “about how ma…