Charmian Carr, the actress best known for sweetly depicting the eldest von Trapp daughter in Rodgers and Hammerstein’s ”The Sound of Music,” died Saturday. She was 73.

Ms. Carr died of difficulties from an uncommon type of dementia in Los Angeles, her representative, Harlan Boll, said.

At age 21, the actress potrayed Liesl von Trapp in the 1965 film musical ”The Sound of Music.” She broadly played out the tune ”Sixteen Going on Seventeen.”

After ”The Sound of Music,” Ms. Carr’s lone other real Hollywood role was featuring with Anthony Perkins in the 1966 Stephen Sondheim TV musical ”Evening Primrose.” She played a secretive young lady who lived in a retail store.

 

‘‘It’s always sad when a member of the family passes away — and in the case of the ‘family’ of the movie ‘The Sound of Music,’ it’s especially sad when it is the first of the group to go,’’ said Ted Chapin, president of the Rodgers & Hammerstein organization, in a statement. ‘‘Charmian Carr played the oldest von Trapp child, and in some ways she maintained that role in real life — guiding, cheering, supporting and generally being there for the rest of her ‘sisters’ and ‘brothers.’  ’’

‘‘We’re second family,’’ Kym Karath, who played Gretl von Trapp, said in an AP interview last year to commemorate the film’s 50th anniversary. ‘‘As adults, we were deeply bonded, so our lives have really interwoven with each other.’’

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