| 100% | JAKOB | 5 | Track star Ingebrigtsen who, at age 16, became the youngest person in history to run a sub-four-minute mile |
| 36% | TATUM | 5 | Actress O'Neal who was the youngest person to ever win a competitive Oscar, at age 10 |
| 34% | EILISH | 6 | At 18, the youngest person to sweep the four main Grammy categories (Song, Album, Record, Best New Artist) in a single year |
| 33% | MANNYPACQUIAO | 13 | Filipino boxer who recently became the first person to hold a world title in four different decades: 2 wds. |
| 33% | MARAT | 5 | With 31-Across, Russian tennis player who became the youngest man to be ranked #1, at 20, in 2000 |
| 31% | CARLOSALCARAZ | 13 | Spanish tennis player who became the youngest man to be ranked #1, at 19, in 2022: 2 wds. |
| 31% | LLEYTONHEWITT | 13 | Australian tennis player who became the youngest man to be ranked #1, at 20, in 2001: 2 wds. |
| 31% | HINGIS | 6 | Martina who became the youngest-ever Wimbledon doubles winner, at age 15 |
| 30% | SHOHEIOHTANI | 12 | Japanese MLB player who was the first player in history to be a pitcher and hitter in the All-Star Game, in 2021: 2 wds. |
| 30% | BACKSTORY | 9 | Fictional past, or a hint to four-letter words found in the starred answers |
| 29% | XGAMES | 6 | 2013 competition where Mitchie Brusco became the first person to land a 1080 at in the Big Air event |
| 29% | MARIAHCAREY | 11 | "Fantasy" singer who recently became the first person to top the Billboard Hot 100 in four different decades: 2 wds. |
| 29% | IVANIV | 6 | Person who became the Grand Prince of Moscow at the age of three and first Tsar of all Russia at age 16 |
| 28% | TEN | 3 | Tatum O’Neal’s age when she became the youngest Oscar winner in history, in 1974 |
| 28% | ERNIEELS | 8 | Golfer who became the youngest-ever winner of the South African Amateur Championship at age 17 |
| 28% | BILLYBUSH | 9 | Former TV star who's contrite for his role in the "Access Hollywood" tape scandal, saying "I'm grateful to be a more conscientious person now": 2 wds. |
| 28% | ROALDAMUNDSEN | 13 | Norwegian explorer who in 1911 became the first person to reach the South Pole, one month ahead of 18-Across: 2 wds. |
| 28% | GIBB | 4 | Bobbi, who in 1966 became the first woman to run the entire Boston Marathon |
| 27% | STABLEBOY | 9 | Person in a barn who tends to the animals |
| 27% | ONTHEROAD | 9 | Kerouac novel, and a hint to the four starred women in this puzzle |
| 27% | MILE | 4 | Roger Bannister was the first to run it in under four minutes |
| 27% | ANDREWLUCK | 10 | Four-time Pro Bowl quarterback who retired in 2019 at the age of 29: 2 wds. |
| 27% | JENNA | 5 | Marbles who is the first social-media star to have a wax statue at Madame Tussauds |
| 27% | VOICE | 5 | With 64-Across, performer who is like the words sounded out at the starts of the answers to the four starred clues |
| 27% | ELON | 4 | Musk who set a record for the largest loss of personal fortune in history, according to Guinness |
| 27% | LLEYTONHEWITT | 13 | Australian tennis player who, at 20, was the youngest man to be ranked #1 in singles: 2 wds. |
| 27% | HSING | 5 | Ariel, who became the youngest ever U.S. table tennis national champion, aged 15, in 2010 |
| 26% | CHADWICKBOSEMAN | 15 | Marvel Cinematic Universe star who died at age forty-three in August, 2020 |
| 26% | BETTY | 5 | With 36-Across, "The Golden Girls" star who won a Grammy Award for Best Spoken Word Album at age 90 |
| 26% | LOIS | 4 | Smith who, in 2021, at the age of ninety, became the oldest winner of an acting Tony |