There are a lot of 1950s and 1960s aircraft designs still flying. That was when smart people went into aircraft design, and it was the most productive period in aircraft design history, as everything went jet-powered. The B-52, the B-737, the B-747, the SR-71, and the Concorde are all from that period. (So are a lot of duds, of interest only to aviation historians.)
Ben Rich, former head of the Lockheed Skunk Works, once remarked that he'd worked on 30-some aircraft in his career, but today's engineer will be lucky to work on one.
Ben Rich, former head of the Lockheed Skunk Works, once remarked that he'd worked on 30-some aircraft in his career, but today's engineer will be lucky to work on one.