Youngest champions: since 2010
Youngest fighters to win an undisputed UFC title, by age on the day.
Reigns are derived from championship bouts. When a belt was vacated or stripped outside a title fight, the reign is shown ending at the next title fight in that division, so a few run long; a title awarded without a fight (José Aldo's in 2010, for one) starts at the champion's first UFC title fight.
78 fighters.
| # | Fighter | Age | Division | Won | Ended |
|---|---|---|---|---|---|
| 51 | Cristiane Justino | 32 years, 20 days | Women's Featherweight | Jul 29, 2017 | Dec 29, 2018 |
| 52 | Julianna Pena | 32 years, 114 days | Women's Bantamweight | Dec 11, 2021 | Jul 30, 2022 |
| 53 | Eddie Alvarez | 32 years, 178 days | Lightweight | Jul 7, 2016 | Nov 12, 2016 |
| 54 | Sean Strickland | 32 years, 194 days | Middleweight | Sep 9, 2023 | Jan 20, 2024 |
| 55 | Tom Aspinall | 32 years, 197 days | Heavyweight | Oct 25, 2025 | Champion |
| 56 | Deiveson Figueiredo | 32 years, 213 days | Flyweight | Jul 18, 2020 | Jun 12, 2021 |
| 57 | Mackenzie Dern | 32 years, 215 days | Women's Strawweight | Oct 25, 2025 | Champion |
| 58 | Robbie Lawler | 32 years, 261 days | Welterweight | Dec 6, 2014 | Jul 30, 2016 |
| 59 | Magomed Ankalaev | 32 years, 279 days | Light Heavyweight | Mar 8, 2025 | Oct 4, 2025 |
| 60 | Germaine de Randamie | 32 years, 293 days | Women's Featherweight | Feb 11, 2017 | Jul 29, 2017 |
| 61 | Alexandre Pantoja | 33 years, 83 days | Flyweight | Jul 8, 2023 | Dec 6, 2025 |
| 62 | Merab Dvalishvili | 33 years, 248 days | Bantamweight | Sep 14, 2024 | Dec 6, 2025 |
| 63 | Stipe Miocic | 33 years, 269 days | Heavyweight | May 14, 2016 | Jul 7, 2018 |
| 64 | Holly Holm | 34 years, 28 days | Women's Bantamweight | Nov 14, 2015 | Mar 5, 2016 |
| 65 | Tyron Woodley | 34 years, 114 days | Welterweight | Jul 30, 2016 | Mar 2, 2019 |
| 66 | Francis Ngannou | 34 years, 203 days | Heavyweight | Mar 27, 2021 | Mar 4, 2023 |
| 67 | Kayla Harrison | 34 years, 340 days | Women's Bantamweight | Jun 7, 2025 | Champion |
| 68 | Alex Pereira | 35 years, 128 days | Middleweight | Nov 12, 2022 | Apr 8, 2023 |
| 69 | Raquel Pennington | 35 years, 137 days | Women's Bantamweight | Jan 20, 2024 | Oct 5, 2024 |
| 70 | Carlos Ulberg | 35 years, 155 days | Light Heavyweight | Apr 11, 2026 | Champion |
| 71 | Belal Muhammad | 36 years, 18 days | Welterweight | Jul 27, 2024 | May 10, 2025 |
| 72 | Daniel Cormier | 36 years, 64 days | Light Heavyweight | May 23, 2015 | Dec 29, 2018 |
| 73 | Georges St-Pierre | 36 years, 169 days | Middleweight | Nov 4, 2017 | Oct 5, 2019 |
| 74 | Michael Bisping | 37 years, 97 days | Middleweight | Jun 4, 2016 | Nov 4, 2017 |
| 75 | Justin Gaethje | 37 years, 212 days | Lightweight | Jun 14, 2026 | Champion |
| 76 | Jan Blachowicz | 37 years, 215 days | Light Heavyweight | Sep 26, 2020 | Oct 30, 2021 |
| 77 | Fabricio Werdum | 37 years, 318 days | Heavyweight | Jun 13, 2015 | May 14, 2016 |
| 78 | Glover Teixeira | 42 years, 2 days | Light Heavyweight | Oct 30, 2021 | Jun 11, 2022 |