An actress best known for her role in the 1965 film “The Sound of Music,” who sang “Sixteen Going on Seventeen” in the musical, has died. The New York Times reports that Charmian Carr died Saturday in Los Angeles.

Her spokesman reported that Carr died of complications from a rare form of dementia. She was 73.

Carr was 21 when she played the eldest Von Trapp daughter, Liesl, in the movie version of the Rodgers and Hammerstein musical.

“After ‘The Sound of Music,’ Ms. Carr’s only other major Hollywood role was starring with Anthony Perkins in the 1966 Stephen Sondheim television musical ‘Evening Primrose.’ She played a mysterious young woman who lived in a department store,” The Times reports.

After leaving acting, Carr ran a design business. She wrote two books about her experiences, “Forever Liesl” and “Letters to Liesl.”

Here’s a clip of Carr performing “Sixteen Going on Seventeen” in the movie …