- May 1 Ana Claudia Talancón, Mexican actress
- May 1 Zaz [Isabelle Geffroy], French singer-songwriter (Je veux), born in Tours, France
- May 1 Inês Henriques, Portuguese race walker (World C'ships gold 50k walk 2017), born in Santarém, Portugal
- May 2 Tim Borowski, German footballer, born in Neubrandenburg, East Germany
- May 2 Miloš Glogovac, Serbian football player, born in Serbia
- May 2 Pierre-Luc Gagnon, Canadian skateboarder, born in Boucherville, Quebec, Canada
- May 2 Zat Knight, English footballer, born in Solihull, England
- May 2 Troy Murphy, American basketball player, born in Morristown, New Jersey
- May 2 Brad Richards, Canadian ice hockey player, born in Murray Harbour, Prince Edward Island, Canada
- May 2 (Elizabeth) "Ellie" Kemper, American actress (The Office -"Erin"; Unbreakable Kimmy Schmidt), born in Kansas City, Missouri
- May 3 Marcel Vigneron, American chef (Top Chef), born in Bainbridge Island, Washington
- May 4 Andrew Raycroft, Canadian ice hockey goalie, born in Belleville, Ontario
- May 5 Yossi Benayoun, Israeli footballer (Israel national team captain), born in Dimona, Israel
- May 5 DerMarr Johnson, American basketball player, born in Washington, D.C.
- May 6 Brooke Bennett, American swimmer (3 Olympic golds), born in Tampa, Florida
- May 6 Kasumi Takahashi, Australian rhythmic gymnast (Olympics 1996), born in Tokyo, Japan
- May 6 Ricardo Oliveira, Brazilian footballer (Clube Atlético Mineiro), born in São Paulo, Brazil
- May 6 Scott Colton, American professional wrestler
- May 6 Mario Stojić, Croatian basketball player
- May 6 Taebin, Korean singer (1TYM)
- May 6 Kelly van der Veer, Dutch reality TV star
- May 7 Johan Kenkhuis, Dutch swimmer
- May 7 Kate Lawler, English reality television personality and disc jockey (won 1st Big Brother), born in London, England
- May 8 Michelle McManus, Scottish pop singer ("All This Time"), born in Glasgow, Scotland
- May 8 Benny Yau, Canadian entertainer
- May 9 Angela Nikodinov, Spartanburg SC, figure skater (1997 Pacif Sr champ)
- May 9 Tony Schmidt, German racing driver
- May 9 Cho Hyeon Jae, South Korean actor
- May 9 Grant Hackett, Australian swimmer
- May 12 Rishi Sunak, British politician (British Chancellor 2020-), born in Southampton, England
- May 13 Waka Inoue, Japanese gravure idol and actress
- May 13 Mau Marcelo, Filipino singer
- May 14 Eugene Martineau, Dutch decathlete
- May 14 Hugo Southwell, Scottish rugby union footballer
- May 14 Zdeněk Grygera, Czech footballer
- May 15 Josh Beckett, American baseball player
- May 15 Rocky Marquette, American actor
- May 16 Michael Ryan, American ice hockey player and coach (Springfield Thunderbirds), born in Boston, Massachusetts
- May 16 Melanie Lofton, American Journalist
- May 17 Davor Džalto, Serbian art historian
- May 17 Dallas Taylor, American Christian metal singer (Maylene and the Sons of Disaster, Underoath), born in Ocala, Florida
- May 17 Stéphane Robert, French professional tennis player, born in Montargis, France
- May 18 Ali Zafar, Pakistani singer and model (Channo), born in Lahore, Pakistan
- May 19 Drew Fuller, American actor/model
- May 19 Tony Hackworth, English footballer
- May 20 Austin Kearns, American Baseball player
- May 21 Chris Raab, American television personality, born in Willow Grove, Pennsylvania
- May 21 Gotye [Wouter De Backer], Belgian-Australian rock singer-songwriter ("Someone That I Used to Know"), born in Bruges, Belgium
- May 22 Rhett Fisher, American actor and musician, born in Indianapolis, Indiana
- May 22 Steven Baker, Australian rules footballer
- May 22 Chad Tracy, American baseball player
- May 23 Sarah Louise Catherwood, 4x200m swimmer (Olympics 1996), born in Christchurch, New Zealand
- May 23 Theofanis Gekas, Greek footballer
- May 23 Lane Garrison, American actor
- May 24 Billy L. Sullivan, American actor (Will Pacino-Something So Right), born in Long Island, New York
- May 24 Cecilia Cheung, Hong Kong-Australian actress (Fly Me To Polaris) and cantopop singer, born in Hong Kong
- May 25 Jae Hee, South Korean actor (Sassy Girl Chun-hyang), born in Seoul
- May 25 David Navarro, Spanish footballer, born in Sagunto, Spain
- May 27 Jessica Deglau, 200m butterfly (Olympics 1996), born in Vancouver, British Columbia
- May 28 Miguel Pérez, Spanish footballer
- May 28 Mark Feehily, Irish pop singer (Westlife - "Flying Without Wings"), born in Sligo, Ireland
- May 30 Steven Gerrard, English footballer
- May 31 Andy Hurley, American drummer (Fall Out Boy - "This Ain't a Scene, It's an Arms Race"), born in Menomonee Falls, Wisconsin
About May 1980
How Old? 41 years old
Generation: Generation X
Leap Year: Yes