- Oct 1 Matt Cain, American baseball pitcher (SF Giants; perfect game 2012; MLB All Star 2009, 11-12), born in Dothan, Alabama
- Oct 2 John Morris, American voice actor (Toy Story), born in Paris, Texas
- Oct 2 Marion Bartoli, French tennis player (Wimbledon 2013), born in Haute-Loire, France
- Oct 3 Ashlee Simpson, American pop singer (Autobiography), born in Waco, Texas
- Oct 3 Yoon Eun Hye, South Korean actress
- Oct 4 Álvaro Parente, Portuguese auto racer (British F3 C’ship 2005; Formula Renault 3.5 Series 2007), born in Porto, Portugal
- Oct 4 Lena Katina, Russian singer (t.A.T.u.)
- Oct 5 Kenwyne Jones, Trinidadian footballer, born in Point Fortin, Trinidad and Tobago
- Oct 6 Joanna Pacitti, American actress and singer
- Oct 7 Ikuta Toma, Japanese singer & actor, born in Hokkaido, Japan
- Oct 7 Salman Butt, Pakistani cricketer, born in Lahore, Pakistan
- Oct 9 Ghetts [Justin Clarke], British musician, born in Plaistow, East London, England
- Oct 9 Marie Kondo, Japanese organizational guru (The Life-Changing Magic of Tidying Up), born in Tokyo, Japan
- Oct 10 Chiaki Kuriyama, Japanese actress (Battle Royale), born in Tsuchiura, Ibaraki, Japan
- Oct 10 Paul Posluszny, American football linebacker (Pro Bowl 2013 Jacksonville Jaguars), born in Butler, Pennsylvania
- Oct 10 Rod Benson, American basketball player, born in Fairfield, California
- Oct 10 Stephanie Cheng, Hong Kong singer (Traffic Light), born in Hong Kong
- Oct 10 Troy Tulowitzki, American baseball shortstop (MLB All Star 2010, 11, 13–15; Gold Glove Award 2010, 11; Colorado Rockies), born in Santa Clara, California
- Oct 11 Martha MacIsaac, Canadian actress (Superbad), born in Charlottetown, Prince Edward Island
- Oct 11 Sergio Hellings, Dutch footballer (Roeselare), born in Amsterdam
- Oct 13 Frank Simek, American soccer player, born in St. Louis, Missouri
- Oct 13 Misono [Kōda], Japanese pop singer (Day After Tomorrow; "It's All Love!"), and TV personality (Quiz! Hexagon II), born in Kyoto, Japan
- Oct 14 LaRon Landry, American NFL football player, 2007-14 (Washington Redskins, and 2 other teams), born in Metairie, Louisiana
- Oct 15 Jessie Ware, British pop singer-songwriter ("What's Your Pleasure?"), born in Hammersmith, London, England
- Oct 16 Shayne Ward, British singer (UK X Factor - "That's My Goal"), and actor (Coronation Street), born in Tameside, Greater Manchester, England
- Oct 16 Trevor Blumas, Canadian actor
- Oct 17 Chris Lowell, American actor
- Oct 17 Jelle Klaasen, Dutch darts player (BDO World Champion 2006), born in Alphen, Netherlands
- Oct 17 Randall Munroe, American webcomic author
- Oct 18 Esperanza Spalding, American jazz bassist, singer and songwriter (Radio Music Society; 12 Little Spells), born in Portland, Oregon
- Oct 18 Freida Pinto, Indian Bollywood actress (Slumdog Millionaire, Rise of the Planet of the Apes), born in Mumbai, India
Lindsey Vonn (38 years old)
Oct 18 American alpine skier (Olympic gold 2010, 4 World Cup Championships), born in St. Paul, Minnesota
- Oct 19 Thundercat [Stephen Bruner], American bass guitarist (Flying Lotus), born in Los Angeles, California
- Oct 20 Andrew Trimble, Northern Irish rugby player (Irish national team), born in Coleraine, Northern Ireland
- Oct 21 Anouk Leblanc-Boucher, French Canadian short track speed skater
- Oct 21 Kenny Cooper, American soccer forward (10 caps), born in Baltimore, Maryland
- Oct 21 Kieran Richardson, English soccer utility (8 caps; Manchester United, Sunderland, Fulham, Aston Villa), born in Greenwich, England
- Oct 21 Marvin Mitchell, American football player
- Oct 23 Izabel Goulart, Brazilian model (Victoria's Secret), born in ão Carlos, Brazil
- Oct 23 Meghan McCain, American columnist, author, and TV host, born in Phoenix, Arizona
- Oct 24 Kaela Kimura, Japanese model and singer (Rirura Riruha), born in Adachi, Tokyo
Katy Perry (38 years old)
Oct 25 American pop singer ("I Kissed A Girl"; "Teenage Dream"; "Firework"), and TV personality (American Idol, 2018-present), born in Santa Barbara, California
- Oct 25 Sara Lumholdt, Swedish musician (A-Teens), born in Stockholm, Sweden
- Oct 26 Adriano Correia Claro, Brazilian footballer, born in Curitiba, Brazil
- Oct 26 Amanda Overmyer, American singer (American Idol season 7 finalist), born in Mulberry, Indiana
- Oct 26 Jefferson Farfán, Peruvian footballer (PSV), born in Lima, Peru
- Oct 26 Sasha Cohen, American figure skater (Grand Prix Final Champion 2003; Olympic silver 2006), born in Los Angeles, California
- Oct 27 Brady Quinn, American football quarterback (Cleveland Browns, Denver Broncos) and broadcaster (CBS Sports HQ, Fox Sports), born in Columbus, Ohio
- Oct 27 Irfan Pathan, Indian cricket all-rounder (29 Tests, 1 x 100, HS 102, 100 wickets, BB 7/59; 120 ODIs; Baroda, Middlesex CCC, Kings XI Punjab, Delhi Daredevils), born in Vadodara, Gujarat, India
- Oct 27 Kelly Osbourne, English television personality (The Osbournes), born in Westminster, London
- Oct 28 Amanda Paige, American model
- Oct 28 Obafemi Martins, Nigerian footballer
- Oct 29 Chris Baio, American rock bassist ((Vampire Weekend - "A-Punk"; "Oxford Comma"), born in Bronxville, New York
- Oct 29 Eric Staal, Canadian ice hockey center (Stanley Cup 2006 Carolina Hurricanes; World C'ship gold 2007; Winter Olympic gold 2010), born in Thunder Bay, Ontario
- Oct 30 Eva Pigford, American actress and fashion model, born in Los Angeles, California
About October 1984
How Old? 38 years old
Generation: Millennial
Leap Year: Yes