- Oct 3 Angel Yin, American golfer (US Women's Open 2019 runner-up), born in Los Angeles, California
- Oct 6 Mia-Sophie Wellenbrink, German child actress and pop singer, born in Munich, Germany
- Oct 17 Erin Kellyman, British actress (The Falcon and the Winter Soldier), born in Staffordshire, England
- Oct 18 Julia Wróblewska, Polish actress
Roddy Ricch (25 years old)
Oct 22 American rapper and singer-songwriter (Please Excuse Me for Being Antisocial; "The Box"), born in Compton, California
- Oct 23 Amandla Stenberg, American actress (Hunger Games), born in Los Angeles, California
- Oct 24 Daya [Grace Martine Tandon]. American singer (Hide Away), born in Mt. Lebanon, Pennsylvania
- Oct 28 Stephen Nedoroscik, American gymnast 'the pommel horse guy' (2021 Pommel World Champion, 2024 Olympic Team Bronze), born in Worcester, Massachusetts [1]
- Oct 29 Lance Stoll, Canadian-Belgian F1 racing driver, born in Montreal, Quebec
- Oct 30 Cale Makar, Canadian ice hockey defenceman (Stanley Cup, Conn Smythe Trophy, Norris Trophy 2022; Calder Trophy 2020; Colorado Avalanche), born in Calgary, Alberta
About October 1998
How Old? 25 years old
Generation: Generation Z
Leap Year: No