- Jan 1 Jeff Carter, Canadian ice hockey center (Stanley Cup 2012, 14; NHL All-Star 2009, 17; Philadelphia Flyers, LA Kings), born in London, Ontario
- Jan 1 Steven Davis, Northern Irish soccer midfielder (117 caps [2019]; Rangers, Southampton), born in Ballymena, Northern Ireland
- Jan 1 Tiago Splitter, Brazilian basketball forward and coach (NBA C'ship 2014, San Antonio Spurs; All-EuroLeague Team selection 2008-10), born in Blumenau, Brazil
- Jan 2 Heather O'Reilly, American soccer midfielder (231 caps; FIFA Women's World Cup 2015; Olympic gold 2004, 08, 12), born in East Brunswick, New Jersey
- Jan 2 Ivan Dodig, Croatian tennis player (6 x Grand Slam doubles titles; Davis Cup 2018), born in Međugorje, Bosnia and Herzegovina
- Jan 4 Al Jefferson, American basketball player, born in Monticello, Mississippi
- Jan 4 Fernando Rees, Brazilian race car driver, born in São Paulo, Brazil
Lewis Hamilton (39 years old)
Jan 7 English auto racer (World Formula 1 Drivers Champion 2008, 14-15, 17-20), born in Stevenage, England
- Jan 11 Kazuki Nakajima, Japanese racing driver, born in Aichi Prefecture, Japan
- Jan 12 Artem Milevskiy, Ukrainian footballer, born in Minsk, Belarus
- Jan 14 Joel Rosario, Dominican jockey (Kentucky Derby, Dubai World Cup 2013; Belmont Stakes 2014, 19), born in San Francisco, Dominican Republic
- Jan 15 Kenneth Emil Petersen, Danish footballer, born in Solrød Strand, Denmark
- Jan 16 Joe Flacco, American NFL player (Baltimore Ravens), born in Audubon, New Jersey
- Jan 18 Riccardo Montolivo, Italian soccer player, born in Milan, Italy
- Jan 19 Benny Feilhaber, American soccer player, born in Rio de Janeiro, Brazil
- Jan 19 Esteban Guerrieri, Argentine racing driver, born in Buenos Aires, Argentina
- Jan 21 Adrian Lewis, English darts player (PDC World Champion 2011-12), born in Stoke-on-Trent, England
- Jan 21 Alex Pérez, Spanish footballer, born in Madrid, Spain
- Jan 21 Matt Unicomb, Australian basketball player, born in Hornsby, Australia
- Jan 22 Mohamed Sissoko, Malian footballer, born in Mont-Saint-Aignan, France
- Jan 23 Dong Fangzhuo, Chinese football player, born in Dalian, China
- Jan 25 Patrick Willis, American Pro Football HOF linebacker (NFL Defensive Rookie of the Year 2007; 5 × First-team All-Pro; 7 × Pro Bowl; NFL tackles leader 2007, 09; SF 49ers), born in Bruceton, Tennessee
- Jan 28 Arnold Mvuemba, French footballer
- Jan 29 Marc Gasol, Spanish basketball center (NBA C'ship 2019 Toronto Raptors; NBA All-Star 2012, 15, 17; All-NBA First Team 2015; NBA Defensive Player of the Year 2013), born in Barcelona, Spain
- Jan 30 Trae Williams, American football player, born in South Brisbane, Australia
- Jan 31 Adam Federici, Australian football player, born in Nowra, Australia
- Jan 31 Mario Williams, American football defensive end, born in Richlands, North Carolina
About January 1985
How Old? 39 years old
Generation: Millennial
Leap Year: No
Baseball Players
Basketball Stars
Boxers
Footballers
NFL Stars
Tennis Champions