- Dec 1 Mohammad Kaif, Indian cricket batsman (13 Tests, top score 148; 125 ODIs), born in Allahabad, Uttar Pradesh, India
- Dec 1 Mubarak Hassan Shami, Qatari athlete (Vienna 2005, Prague 2006, Paris 2007 marathons), born in Baringo, Kenya
- Dec 2 Adam Kreek, Canadian rower (Olympic gold eights 2008; World C'ship gold 2002-3, 07), born in London, Ontario
- Dec 2 Bartosz Koziak, Polish classical cellist, born in Zakopane, Poland
- Dec 3 Anna Chlumsky, American actress (My Girl, Veep), born in Chicago, Illinois
- Dec 3 Jenna Dewan, American actress
- Dec 5 Ibrahim Maalouf, Lebanese-born French trumpeter, born in Beirut, Lebanon
- Dec 5 Shizuka Itō, Japanese voice actress (seiyū), born in Tokyo, Japan
- Dec 6 Ehren Wassermann, American baseball player, born in Sylacauga, Alabama
- Dec 6 Steve Lovell, British footballer (Dundee), born in Amersham, England
- Dec 7 John Terry, English soccer defender (78 caps; Chelsea), born in London, England
- Dec 8 Brandt Snedeker, American golfer (US Masters 2008, British Open 2012 3rd), born in Nashville, Tennessee
- Dec 9 Ryder Hesjedal, Canadian cyclist, born in Victoria, Canada
- Dec 9 Simon Helberg, American actor (The Big Bang Theory), born in Los Angeles, California
- Dec 10 Massari [Sari Abboud], Lebanese-born Canadian R&B singer (Be Easy), born in Beirut, Lebanon
- Dec 10 Sarah Chang, Korean-American classical violinist child prodigy, born in Philadelphia, Pennsylvania
- Dec 11 Arya [Jamshad Cethirakath], Indian actor, born in Trikaripur, Kerala
- Dec 14 Didier Zokora, Ivorian footballer, born in Abidjan, Ivory Coast
- Dec 14 Tata Young, Thai-American singer, born in Bangkok, Thailand
- Dec 15 Annalena Baerbock, Germany politician (Leader of the Greens Party), born in Hanover, West Germany
- Dec 15 Sergio Pizzorno, British rock guitarist, songwriter, and singer (Kasabian; Loose Tapestries), born in Newton Abbot, Devon, England
- Dec 17 Eli Pariser, American political activist (MoveOn.org)
- Dec 17 Ryan Hunter-Reay, American race car driver
Christina Aguilera (43 years old)
Dec 18 American singer ("Genie in a Bottle"; "What a Girl Wants"), and TV personality (The Voice, 2011-16), born in Staten Island, New York
Jake Gyllenhaal (43 years old)
Dec 19 American actor (Donnie Darko, Jarhead), born in Los Angeles, California
- Dec 19 Marla Sokoloff, American actress (The Practice), born in San Francisco, California
- Dec 20 Ashley Cole, English soccer defender (107 caps; Arsenal 156 games, Chelsea 229 games, LA Galaxy), born in London, England
- Dec 20 Fitz Hall, English footballer, born in Leytonstone, London
- Dec 20 Tony [Anthony da Silva], French-born Portuguese footballer, born in Le Creusot, France
- Dec 21 Royce Ring, American baseball player, born in La Mesa, California
- Dec 22 Chris Carmack, American actor, born in Washington, D.C.
- Dec 23 Cody Ross, American baseball player, born in Portales, New Mexico
- Dec 24 Tomas Kalnoky, American musician (Streetlight Manifesto), born in Prague, Czechoslovakia
- Dec 25 Laura Sadler, British actress, born in Ascot, United Kingdom (d. 2003)
- Dec 25 Locó [Manuel Armindo Morais Cange], Angolan soccer defender (40 caps; Primeiro de Agosto, Petro Atlético, Santos), born in Luanda, Angola
- Dec 25 Marcus Trufant, American football cornerback (Pro Bowl 2007 Seattle Seahawks; Jacksonville Jaguars), born in Tacoma, Washington
- Dec 25 Reika Hashimoto, Japanese actress, born in Tokyo, Japan
- Dec 27 Cas Haley, American roots, rock, and reggae singer-songwriter and multi-instrumentalist, born in Paris, Texas
- Dec 27 Claudio Castagnoli, Swiss wrestler
- Dec 28 Lomana LuaLua, Congolese football player, born in Kinshasa, Democratic Republic of the Congo
- Dec 28 Vanessa Ferlito, American actress, born in Brooklyn, New York
- Dec 30 Eliza Dushku, American actress (True Lies, Buffy the Vampire Slayer), born in Boston, Massachusetts
- Dec 30 Kenny Kwan, Hong Kong singer (Boy'z), and actor (Banana Boys), born in The Philippines
- Dec 31 Matt Cross, American professional wrestler, born in Brecksville, Ohio
Richie McCaw (43 years old)
Dec 31 New Zealand rugby union flanker (148 Tests, 110 as captain All Blacks; 3 x IRB Player of the Year; Rugby World Cup 2011, 15; IRB HOF), born in Oamaru, New Zealand
About December 1980
How Old? 43 years old
Generation: Generation X
Leap Year: Yes
Chinese Zodiac: Monkey
Star Signs: Sagittarius (Nov 22 - Dec 21), Capricorn (Dec 22 - Jan 19)
Greatest Generation
Silent Generation
Baby Boomer
Generation X
Millennial
Generation Z