Greta Thunberg (21 years old)
Jan 3 Swedish climate change activist, born in Stockholm, Sweden
- Jan 4 Jaeden Martell, American actor (Bill Denbrough-It; Knives Out), born in Philadelphia, Pennsylvania,
- Jan 24 Johnny Orlando, Canadian pop singer-songwriter ("Waste My Time"), born in Mississauga, Ontario
- Jan 26 Robby Novak [Kid President], American internet personality (YouTube), born in Henderson, Tennessee
- Jan 28 Whitney Peak, Ugandan-Canadian actress (Gossip Girl), born in Kampala, Uganda
About January 2003
How Old? 21 years old
Generation: Generation Z
Leap Year: No
20-29
30-39
40-49
50-59
80-89
Over 90