Cast Age Comparison
| Actor | Character | Actor Age | Char Age | Conf | Diff | Source/Hints | |
|---|---|---|---|---|---|---|---|
 |
Cillian Murphy | J. Robert Oppenheimer | 47 | 41 | C4 | +6 | Wikipedia: Oppenheimer born April 22, 1904. Trinity test July 16, 1945. |
 |
Emily Blunt | Kitty Oppenheimer | 40 | 34 | C4 | +6 | Wikipedia: Katherine (Kitty) Harrison born August 8, 1910. |
 |
Matt Damon | Leslie Groves | 52 | 48 | C4 | +4 | Wikipedia: Groves born August 17, 1896. |
 |
Robert Downey Jr. | Lewis Strauss | 58 | 58 | C4 | 0 | Wikipedia: Strauss born January 31, 1896. AEC hearings 1954. |
 |
Florence Pugh | Jean Tatlock | 27 | 29 | C4 | -2 | Wikipedia: Tatlock born February 21, 1914. Died January 4, 1944. |
 |
Josh Hartnett | Ernest Lawrence | 44 | 43 | C4 | +1 | Wikipedia: Lawrence born August 8, 1901. |
 |
Casey Affleck | Boris Pash | 47 | 45 | C4 | +2 | Wikipedia: Pash born June 20, 1900. |
 |
Rami Malek | David Hill | 42 | 25 | C4 | +17 | Wikipedia: David L. Hill born November 11, 1919. |
 |
Kenneth Branagh | Niels Bohr | 62 | 59 | C4 | +3 | Wikipedia: Bohr born October 7, 1885. |
 |
Benny Safdie | Edward Teller | 37 | 37 | C4 | 0 | Wikipedia: Teller born January 15, 1908. |
Actor Age
Actor’s real age when the production was filmed or released
Char Age
The character’s age as stated or implied in the story
Diff
Difference between actor age and character age (green = close, red = far apart)
Source/Hints
Where the character age was found or how it was inferred
Confidence Scale
C5
Canonical — age explicitly stated in the production
C4
Canonical — derived from dates or events in the story
C3
Strong secondary source (script, novelization, creator interview)
C2
Inferred range — estimated from context clues
C1
Unknown — no reliable age information found