Cast Age Comparison
| Actor | Character | Actor Age | Char Age | Conf | Diff | Source/Hints | |
|---|---|---|---|---|---|---|---|
 |
Allison Williams | Morgan Grant | 37 | 34 | C3 | +3 | Colleen Hoover Wiki lists Morgan's age as 34; she was 17 when pregnant with Clara who is now 17 |
 |
Mckenna Grace | Clara Grant | 19 | 17 | C3 | +2 | Colleen Hoover Wiki lists Clara's age as 17 with birthdate April 11, 2008 |
 |
Dave Franco | Jonah Sullivan | 40 | 35 | C3 | +5 | Colleen Hoover Wiki lists Jonah's age as 35 |
 |
Mason Thames | Miller Adams | 18 | 17 | C3 | +1 | Colleen Hoover Wiki lists Miller's age as 17 with birthdate December 15, 2007 |
 |
Willa Fitzgerald | Jenny Davidson | 34 | 33 | C3 | +1 | Colleen Hoover Wiki lists Jenny's age as 33 at time of death |
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