Peter Burling (33 years old)
Jan 1 New Zealand sailor (Olympic gold 49er class 2016, silver 2012, 20; helmsman America's Cup 2017, 21; ISAF World Sailor of the Year 2015, 17), born in Tauranga, New Zealand
- Jan 2 Ben Hardy, English actor (X-Men: Apocalypse; Bohemian Rhapsody), born in Bournemouth, England
- Jan 2 Josh Taylor, Scottish boxer (undisputed world light-welterweight title 2021), born in Prestonpans, Scotland
- Jan 4 Charles Melton, American actor (Riverdale), born in Juneau, Alaska
- 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 (Michaela) "Mj" Rodriguez, American actress and singer, born in Newark, New Jersey
- Jan 7 Caster Semenya, South African athlete (Olympic gold women's 800m 2012, 16; World C'ship gold 2009, 11, 17; testosterone controversy), born in Polokwane, South Africa
- Jan 7 Eden Hazard, Belgian football player (Chelsea, Belgian national team), born in La Louvière, Belgium
- Jan 7 Max Morrow, Canadian actor, born in Toronto, Ontario
- Jan 8 Asuka Hinoi, Japanese J-pop singer, and actress, born in Osaka, Japan
- Jan 15 Ayeza Khan, Pakistani actress (Meray Paas Tum Ho), born in Karachi, Pakistan
- 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 25 Ariana DeBose, American actress and singer (West Side Story), born in North Carolina
- Jan 29 Amberley Snyder, American barrel racer (subject of Netflix film "Walk, Ride. Rodeo), born in California
- Jan 29 Hugh Grosvenor, 7th Duke of Grosvenor, English nobleman, and one of UK's richest people, born in Westminster, London
- Jan 30 Erik Valdemar Sköld, Swedish contemporary classical composer (Isolation), born in Malmö, Sweden
- Jan 30 Matthew Werkmeister, Australian actor, born in Melbourne, Australia
- Jan 30 Rebecca Lovell, American singer and guitarist (Larkin Poe), born in Atlanta, Georgia
About January 1991
How Old? 33 years old
Generation: Millennial
Leap Year: No
20-29
30-39
40-49
50-59
80-89
Over 90