Robert Mills Delaney, sometimes incorrectly spelled Delany (1903-1956) was an American composer. He studied with Nadia Boulanger and Arthur Honegger in Paris, and was best known for his 1928 choral symphony, John Brown's Song, based on Stephen Benet's Pulitzer Prize winning poem "John Brown's Body".
Robert Delaney died when he was 53 years old.
From the context, we know that Robert Delaney lived from 1903-1956. However, since we don't know his exact dates of birth or death, we can't determine his age when he died. I think that the system had trouble with this because it simply used the years of birth and death to attempt to determine his age.