The fastest youth athletes
| # | Athlete | Nat | Date of Birth | Age | Mark | Venue | Date |
| 1 | Cooper Lutkenhaus | USA | 19-12-2008 | 16 | 1.42.27 | Eugene OR | 03-08-2025 |
| 2 | Timothy Kitum | KEN | 20-11-1994 | 17 | 1.42.53 | London | 09-08-2012 |
| 3 | Mohammed Aman | ETH | 10-01-1994 | 17 | 1.43.37 | Rieti | 10-09-2011 |
| 4 | Leonard Kosencha | KEN | 21-08-1994 | 17 | 1.43.40 | Monaco | 20-07-2012 |
| 5 | Emmanuel Wanyonyi | KEN | 01-08-2004 | 17 | 1.43.76 | Nairobi | 22-08-2021 |
| 6 | Edwin Melly | KEN | 06-07-1995 | 17 | 1.43.81 | Rieti | 09-09-2012 |
| 7 | Alfred Kipketer | KEN | 28-12-1996 | 17 | 1.43.95 | Eugene OR | 27-07-2014 |
| 8 | Ermiyas Girma | ETH | 20-01-2005 | 17 | 1.44.36 | Lokeren | 22-05-2022 |
| 9 | Willy Tarbei | KEN | 30-05-1998 | 17 | 1.44.51 | Nairobi | 17-06-2015 |
| 10 | Krzysztof Róznicki | POL | 29-08-2003 | 17 | 1.44.51 | Chorzów | 20-06-2021 |
| 11 | Kipyegon Bett | KEN | 02-01-1998 | 17 | 1.44.55 | Nairobi | 17-06-2015 |
| 12 | Boaz Kiprugut | KEN | 01-07-1998 | 17 | 1.44.64 | Nairobi | 28-05-2016 |
| 13 | Benjamin Kipkurui | KEN | 28-12-1980 | 17 | 1.44.71 | Leverkusen | 09-08-1998 |
| 14 | Benson Koech | KEN | 10-11-1974 | 17 | 1.44.77 | Seoul | 19-09-1992 |
| 15 | Ko Ochiai | JPN | 17-08-2006 | 17 | 1.44.80 | Fukuoka | 31-07-2024 |
| 16 | Noah Kibet | KEN | 12-04-2004 | 17 | 1.44.88 | Nairobi | 22-08-2021 |