- Jan 3 Yoichiro Kakitani, Japanese soccer midfielder (18 caps; Cerezo Osaka), born in Osaka, Japan
- Jan 4 Toni Kroos, German soccer midfielder (106 caps, FIFA World Cup 2014; Bayern Munich, Real Madrid), born in Greifswald, Germany
- Jan 7 Camryn Grimes, American actress, born in Van Nuys, California
- Jan 7 Elene Gedevanishvili, Georgian figure skater, born in Tbilisi, Georgia
- Jan 7 Gregor Schlierenzauer, Austrian ski jumper, born in Tyrol, Austria
- Jan 7 Liam Aiken, American actor, born in New York City
- Jan 8 Maci Wainwright, American country music singer, born in Edmond, Oklahoma
- Jan 10 Tao Li, Singaporean Olympic swimmer, born in Wuhan, China
- Jan 12 Sergey Karjakin, Ukrainian chess player, born in Simferopol
Liam Hemsworth (34 years old)
Jan 13 Australian actor (Hunger Games films), born in Melbourne, Victoria
- Jan 14 Grant Gustin, American actor and singer (The Flash; Glee), born in Norfolk, Virginia
- Jan 15 Chris Warren Jr., American actor, born in Indianapolis, Indiana
- Jan 15 Fernando Forestieri, Italian footballer, born in Rosario, Argentina
- Jan 18 Gift Ngoepe, South African-born baseball player, 1st black African to play in Major League Baseball, born in Pietersburg, South Africa
- Jan 18 Nacho [José Ignacio Fernández Iglesias] Spanish football player (Real Madrid, Spain), born in Madrid, Spain
- Jan 21 Jacob Smith, American actor
- Jan 26 Christopher Massey, American actor, born in Atlanta, Georgia
Peter Sagan (34 years old)
Jan 26 Slovakian professional cyclist (World Road Champion 2016), born in Žilina, Slovakia
- Jan 26 Sergio Perez, Mexican F1 racing driver, born in Guadalajara, Mexico
- Jan 30 Eiza Gonzalez, Mexican actress and singer, born in Mexico City
- Jan 30 Jake Thomas, American actor (A.I. Artificial Intelligence, Lizzie McGuire), born in Knoxville, Tennessee
About January 1990
How Old? 34 years old
Generation: Millennial
Leap Year: No
20-29
30-39
40-49
50-59
80-89
Over 90