Decathlon gold medalist Bruce Jenner throws the javelin during an Olympic competition in Montreal on July 30, 1976. AP hide caption

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"Hot Rod" Hundley (right) does postgame commentary with Ron Boone after the Utah Jazz-Seattle SuperSonics game on May 5, 2000, in Salt Lake City. Douglas C. Pizac/AP hide caption

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San Francisco 49ers linebacker Chris Borland, center, during an NFL football game in Santa Clara, Calif. Borland announced that he will retire after just one season to protect himself from brain injuries. Marcio Jose Sanchez/AP hide caption

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Arizona State fans showcase their Curtain of Distraction during a game against UCLA on Feb. 18 in Tempe, Ariz. Rick Scuteri/AP hide caption

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Syracuse coach Jim Boeheim, right, speaks with an official during the first half of an NCAA college basketball game against Duke in Durham, N.C., on Feb. 28 Gerry Broome/AP hide caption

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New York Yankee Alex Rodriguez watches from the dugout during an intrasquad game at a spring training baseball workout Monday in Tampa, Fla. Lynne Sladky/AP hide caption

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Kurt Busch drives during the NASCAR Sprint Cup Series auto race in Fort Worth, Texas, on Nov. 2, 2014. Busch was recently suspended indefinitely amid domestic violence accusations. Larry Papke/AP hide caption

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Kentucky's Aaron Harrison and coach John Calipari watch from the sideline during the second half of an NCAA college basketball game against Mississippi on Jan. 6. Kentucky won 89-86 in overtime. James Crisp/AP hide caption

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UNC Tar Heels head basketball coach Dean Smith gives instructions during a 1997 playoff game against the Colorado Buffaloes. Smith died Saturday. He was 83. Doug Pensinger/Getty Images hide caption

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Tiger Woods on the ninth hole during the second round of the Phoenix Open last Friday, in Scottsdale, Ariz. Woods, who'll turn 40 this year, is making Frank Deford wonder: How does an athlete know when to retire? Rick Scuteri/AP hide caption

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Sweetness And Light

Dear Aging Athletes: Say Hello To Goodbye

Commentator Frank Deford contemplates the difficulty of knowing when to quit.

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Rafael Nadal (right) shakes hands with Tim Smyczek after winning a match at the Australian Open on Jan. 21. Rob Griffith/AP hide caption

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The Atlanta Hawks' Mike Scott scores over the Detroit Pistons' Greg Monroe in a game Monday. The Hawks are currently leading the NBA's Eastern Conference. Dave Tulis/AP hide caption

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Boston is in the running to host the 2024 Olympics. walknboston/Flickr hide caption

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The Yale football team in an undated photo. Commentator Frank Deford finds it curious that a sport as brutal as football became popular among the academic elite. AP hide caption

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Sports commentator Mike "Doc" Emrick waves to fans as he is presented with a jersey by the New Jersey Devils in 2012. Bill Kostroun/AP hide caption

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