Just coincidence that end-to-end stories in this week’s New Yorker magazine feature two men in full stride at 80? Street-fashion Photographer Bill Cunningham, who turns 80 this month, produces a wittily-themed, weekly feature for the New York Times and covers his beat on a bike. The other was architect Frank Gehry, whose field (unlike, say, mathematics) favors those over 50. “I have plenty of work,” he told critic Paul Goldberger at the star-studded eightieth birthday party he threw himself last week. “I don’t feel like eighty. I guess you never think you’re the age you are, and, as long as you don’t look in the mirror, you aren’t.”