30 pictures of Michael Phelps on his 30th birthday

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Michael Phelps speaks to the media after his training session ahead of the Arena Grand Prix at Charlotte.

McClatchy-Tribune photo

Michael Phelps holds a U.S. flag after winning his eighth gold medal of the Beijing Games, breaking Mark Spitz's 36-year-old record for golds in a single Olympics. The Rodgers Forge native capped his historic run by helping the U.S. 4 x 100 medley relay team win the gold medal in a world-record time of 3 minutes, 29.34 seconds.

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Michael Phelps waits to receive his gold medal after cruising to victory in the 200-meter freestyle today in 1 minute, 42.96 seconds, nearly a full second faster than his previous world record.

Gene Sweeney Jr., Baltimore Sun

Michael Phelps photographed during a swim at the NBAC in June of 2014.

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Michael Phelps speaks at a news conference before the Mesa Grand Prix at the Skyline Aquatics Center.

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Michael Phelps stretches before the start of the 200 freestyle preliminaries at the U.S. Olympic Trials in Long Beach, Calif.

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Michael Phelps swims in the preliminaries of the 100-meter butterfly at the U.S. national championships, where he was won three gold medals.

Sun photo by Karl Merton Ferron

Phelps celebrates after winning the gold medal in the 400 IM Saturday in Athens. He won six golds and two bronzes that year.

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Michael Phelps celebrates after the U.S. 400-meter freestyle relay team won the gold medal, breaking the world record with a time of 3 minutes, 8.24 seconds. Phelps' teammate Jason Lezak came from behind in the anchor leg, catching France's Alain Bernard to win by eight-hundredths of a second. In a news conference prior to the start of the Games, Bernard had said that France would "smash" the Americans.

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Olympic medalist swimmer Michael Phelps coaches local children at the Laureus visit to Rocinha during the 2013 Laureus World Sports Awards on March 11, 2013 in Rio de Janeiro, Brazil.

Richard Hartog, Los Angeles Times

Michael Phelps is all smiles as he speaks during a press conference during U.S. Olympic swimming media day.

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Olympic swimming champion Michael Phelps speaks to the press after his trial on Dec. 19 at the John R. Hargrove, Sr. District Court Building in Baltimore.

Gene Sweeney Jr., Baltimore Sun

Michael Phelps runs onto the field before the start of the Ravens' game against the Cincinnati Bengals at M&T Bank Stadium.

Sun photo by Karl Merton Ferron

Michael Phelps, the 19-year-old swimmer from Rodgers Forge, gets ready for a training session at the Aquatic Center in Athens, two days before the opening ceremonies of the Olympics. Phelps could capture as many as eight gold medals.

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Michael Phelps smiles after the United States won the men's 4 x 200-meter freestyle relay final at the 2012 Olympics in London, making Phelps the most-decorated Olympian of all-time.

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Michael Phelps competes in the men's 100-meter butterfly final during the 2014 Arena Grand Prix of Santa Clara.

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Michael Phelps practices for the Mesa Grand Prix at the Skyline Aquatics Center in Arizona.

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Michael Phelps (right) hugs sixth-place finisher Erik Vendt after Phelps won the final of the 200-meter freestyle at the U.S. Olympic trials in Omaha, Neb. Phelps' time was just slightly slower than the world record he set in Melbourne last year.

Karen Jackson, Special to The Sun

Swimmers (from left) James Barone, Dominic Szabo, Kevin Clements and Michael Phelps sport sunglasses and tuxedos at the North Baltimore Aquatic Club's 2004 gala and fundraiser.

Baltimore Sun photo by Christopher T. Assaf

Michael Phelps took batting practice at Orioles spring training.

L.A. Times photo by Richard Hartog

Michael Phelps nears the end of the breaststroke leg during his first-place, world-record effort in the 400 individual medley.

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Michael Phelps swims to victory in the 200 IM at the Arena Pro Swim Series event in Santa Clara, Calif.

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Michael Phelps swims during the men's 100-meter butterfly race at the 2014 USA Swimming Grand Prix Series at Skyline Aquatic Center.

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Former Ravens safety Ed Reed talks with Olympian Michael Phelps before a game between the Ravens and Pittsburgh Steelers at M&T Bank Stadium.

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Michael Phelps holds his silver medal on the podium after the men's 200-meter butterfly final during the 2012 Olympics in London.

Sun photo by Chiaki Kawajiri

Olympian Michael Phelps urges Riverview Elementary School children to cheer for other pupils who just swam with him in his first public appearance in Baltimore since winning eight medals in Athens.

Sun photo by Karl Merton Ferron

Michael Phelps talks with Jon Urbanchek, assistant swim coach at the University of Michigan, during a training session in March.