- Jan 1 Kathleen Herles, American voice actor
- Jan 1 Peter Burling, New Zealand sailor (Olympic gold 49er class 2016; helmsman America's Cup 2017; ISAF World Sailor of the Year 2015, 17), born in Tauranga, New Zealand
- Jan 2 Josh Taylor, Scottish boxer (undisputed world light-welterweight title 2021), born in Prestonpans, Scotland
- Jan 4 Olivia Tennet, New Zealand actress, born in Auckland, New Zealand
- Jan 6 Nikola Saric, Danish footballer, born in Sarajevo, Bosnia and Herzegovina
- Jan 7 Max Morrow, Canadian actor, born in Toronto, Ontario
- Jan 7 Eden Hazard, Belgian football player (Chelsea, Belgian national team), born in La Louvière, Belgium
- Jan 7 Caster Semenya, South African runner (Olympic Gold 2016), born near Polokwane, South Africa
- Jan 8 Asuka Hinoi, Japanese singer, born in Osaka, Japan
- Jan 19 Erin Sanders, American actress, born in Santa Monica, California
- Jan 19 Tommy Fleetwood, British golfer (US Open runner-up 2018; Ryder Cup 2018), born in Southport, England
- Jan 29 Hugh Grosvenor, Earl Grosvenor, Son of the Duke of Westminster, born in Westminster, London
- Jan 30 Matthew Werkmeister, Australian actor, born in Melbourne, Australia
- Jan 30 Rebecca Lovell, American singer & guitarist (Larkin Poe), born in Atlanta, Georgia
About January 1991
How Old? 30 years old
Generation: Millennial
Leap Year: No