| 100% | IVANIV | 6 | Person who became the Grand Prince of Moscow at the age of three and first Tsar of all Russia at age 16 |
| 32% | JORDANROMERO | 12 | Mountaineer who climbed Mount Everest at the age of 13 and later became the youngest climber in the world to complete the Seven Summits: 2 wds. |
| 31% | IVANI | 5 | Person who built the first stone Cathedral of the Archangel in Moscow and was also the first person to be buried there |
| 31% | JAKOB | 5 | Track star Ingebrigtsen who, at age 16, became the youngest person in history to run a sub-four-minute mile |
| 30% | MIKETYSON | 9 | American former boxer who became the youngest heavyweight champion in history in 1986 at the age of 20 years and 4 months: 2 wds. |
| 30% | MOZART | 6 | Composer who wrote his first concerto at the age of five |
| 30% | FIVETOOLPLAYERS | 15 | Term for people who can do all the actions at the starts of 17-, 22-, 35-, 42- and 48-Across |
| 29% | CZECH | 5 | Nationality of a poet and playwright who became the first president of his country |
| 29% | NADIACOMANECI | 13 | Romanian gymnast who won three Olympic gold medals at the age of 15: 2 wds. |
| 28% | MEHTA | 5 | Maestro Zubin who became the music director of the L.A. Philharmonic at age twenty-six |
| 28% | LOIS | 4 | Smith who, in 2021, at the age of ninety, became the oldest winner of an acting Tony |
| 28% | TORIKELLY | 9 | "Nobody Love" singer who first started posting videos on YouTube at the age of 14: 2 wds. |
| 28% | ALEC | 4 | ___ Greven, "How To Talk to Girls" author who published his first book at the age of 9 |
| 28% | NATHANHALE | 10 | Revolutionary War spy who was captured and killed by the British at the age of twenty-one |
| 28% | KELLYCLARKSON | 13 | 16-Across and 45-Across singer who won the first season of "American Idol" (2 wds.) |
| 28% | ELLIE | 5 | ___ Goulding, "Lights" singer who sang at the wedding of Prince William and Kate Middleton |
| 28% | STEVIENICKS | 11 | American singer and songwriter who became the first woman to be inducted twice into the Rock and Roll Hall of Fame: 2 wds. |
| 28% | ALTHEA | 6 | Gibson who was the first person of color to win a tennis Grand Slam event |
| 28% | ANATOMY | 7 | Henry, elected to Britain's Royal Society at the age of 25 and who, six years later, published his 750 page tome about this |
| 27% | ERNIEELS | 8 | Golfer who became the youngest-ever winner of the South African Amateur Championship at age 17 |
| 27% | TIKIBARBER | 10 | NFL running back who played alongside his twin brother, Ronde, at the University of Virginia and on three Pro Bowl teams: 2 wds. |
| 27% | MRPICKLES | 9 | Tortoise that, at age 90, became the dad of hatchlings Dill, Gherkin, and Jalapeño |
| 27% | ETHELRED | 8 | English king (978-1016) who came to the throne at the age of about 12 and had the unfortunate epithet of "the unready" |
| 27% | EDMUNDHILLARY | 13 | Mountaineer who climbed Mount Everest with Tenzing Norgay and became the first climbers to have reached the summit of the mountain: 2 wds. |
| 27% | MARTHAGRAHAM | 12 | American dancer who was the first dancer to perform at the White House and to receive the Presidential Medal of Freedom: 2 wds. |
| 26% | TEEN | 4 | Person between the ages of 12 and 20 |
| 26% | IVANIV | 6 | First monarch to be crowned Tsar of All Russia |
| 26% | MAGNUS | 6 | 2016 documentary film about chess prodigy Carlsen who became a Grandmaster at the age of 13 |
| 26% | OCTAVIAN | 8 | General who became the first emperor of Rome |
| 26% | PYM | 3 | John —, English statesman and opponent of Charles I who helped draft and first proposed the Grand Remonstrance |