- Jan 1 Jason Pierre-Paul, American NFL linebacker (Pro Bowl 2011-12; Super Bowl 2011, New York Giants), born in Deerfield Beach, Florida
- Jan 3 Alex D. Linz, American actor, born in Santa Barbara, California
- Jan 3 Anya Rozova [Anya Kop], Russian American model and America's Next Top Model contestant, born in Leningrad, USSR
- Jan 3 Ben Matulino, New Zealand rugby league forward (23 caps; NZ Warriors, Wests Tigers), born in Wellington, New Zealand
- Jan 3 Kōhei Uchimura, Japanese gymnast (Olympic gold all-round 2012; team, all-round 2016; World C'ships 10 x gold), born in Kitakyushu, Japan
- Jan 4 Graham Rahal, American race car driver, born in Columbus, Ohio
Labrinth [Timothy Lee McKenzie] (34 years old)
Jan 4 British record producer, rapper, and singer-songwriter (Beneath Your Beautiful; Jealous), born in London
- Jan 4 Waxahatchee [Katie Crutchfield], American folk-rock singer-songwriter born in Birmingham, Alabama
- Jan 5 Krisztián Németh, Hungarian soccer striker (37 caps; MTK Budapest, Roda JC, Sporting Kansas City), born in Győr, Hungary
- Jan 6 Baby lion-tailed macaques, at Woodland Park Zoo (Seattle, Washington)
- Jan 7 Emiliano Insúa, Argentine footballer, born in Buenos Aires, Argentina
- Jan 9 Michaella Krajicek, Dutch tennis player, born in Delft, Netherlands
- Jan 13 Bryan Arguez, American soccer player
- Jan 13 Triinu Kivilaan, Estonian pop singer (Vanilla Ninja), born in Viljandi, Estonia
- Jan 14 29-year-old Marie Claude Adam gives birth to sextuplets by Caesarean section in Port Royale, France
- Jan 15 Celinde Schoenmaker, Dutch stage singer and actress, born in Dordrecht, South Holland, Netherlands
Nick Foles (34 years old)
Jan 20 American NFL quarterback (Super Bowl LII MVP), born in Austin, Texas
Yani Tseng (34 years old)
Jan 23 Taiwanese golfer (5 major titles; British Open 2010-11), born in Guishan, Republic of China
- Jan 25 Sheryfa Luna, French R&B singer, born in Évreux, France
- Jan 30 Khleo Thomas, American actor & rapper, born in Anchorage, Alaska
About January 1989
How Old? 33 or 34 years old
Generation: Millennial
Leap Year: No