Carmelo Anthony coined the nickname “Mid Life” for 40-year-old Kurt Thomas during training camp and the name stuck. “Oh my God,” Jason Kidd said. “We were dying.” The irony, of course, is not lost on Kidd. Yes, Thomas is the NBA's oldest player as well as the champion chop-buster of the Knicks locker room. He dishes it out with the best of them but as the senior citizen on the roster Thomas is tormented regularly by the likes of J.R. Smith and Iman Shumpert. He also provides cover for Kidd, who Saturday joins the league’s exclusive 40 Club, whose current membership consists of Thomas, the Clippers’ Grant Hill and Miami’s Juwan Howard. “Kurt’s still the oldest,” Kidd says. “He’s the one that everyone kills.” Thomas is currently sidelined with a broken foot and yet is considering returning for one more season. Kidd, however, is not ready to commit beyond this season. Although he signed a three-year contract with the Knicks last summer, he isn’t ruling out retirement at season's end. Several people close to Kidd have said they wouldn’t be surprised if Kidd, now a backup for the first time in his Hall of Fame career, decides to walk away. “I don’t know,” Kidd told the Daily News. “I’m taking it one year at a time.” Kidd’s brilliant career spans three different decades and includes four teams, 10 All Star appearances and one NBA championship, with the Mavericks in 2011. His regular-season statistics make him a lock to be a first-ballot Hall of Fame point guard: 12,051 assists, 17,471 points, 8,655 rebounds and 107 triple-doubles. Read more: