If ur talking about the Twilight series, New Moon, Heidi isn't a Cullen. She's a member of the Volturi. Her are age is unknown.
There is no Heidi Cullen, In 'Twilight : New Moon' (book & film) Heidi is one of the Volturi , she is not a cullen.
The cast of The Climate Code with Dr. Heidi Cullen - 2006 includes: Heidi Cullen as herself
The Climate Code with Dr. Heidi Cullen - 2006 was released on: USA: 1 October 2006
Edward Cullen, Alice Cullen, Jasper Hale, Rosalie Hale, Emmett Cullen, Esme Cullen, Carlisle Cullen, Aro, Marcus, Felix, Heidi, Jane, Alec, Cauis, and many more characters
Bella Cullen is and forever will be 18 years old. Edward Cullen is and forever will be 17 years old.
Heidi is twelve years old in So B. It
Heidi Range is 34 years old (birthdate: May 23, 1983).
Esme Cullen is over 100 years old
Heidi (and Heather) Burge are both 38.
Heidi Daus is easily in her 50's.
Heidi Mueller is 29 years old (birthdate: January 29, 1982).
Heidi Kozak is 48 years old (birthdate: May 5, 1963).