Ned Rorem will be 89 years old in October. I suppose only Elliott Carter (104 in December :o ;D) and Robert Ward(95 in September) outrank him in age seniority among living American composers. Rorem's music is more accessible to my ears at least than is Carter's.
NED ROREM: A CATALOGUE OF THE ORCHESTRAL AND CHORAL MUSIC
1947: "A Sermon on Miracles" for solo voice, chorus and strings: 6 minutes + (Black Box cd)
1948: Piano Concerto No.1 (withdrawn)
1948-50: Symphony No.1: 22 minutes + (Naxos cd)
1950: "From an Unknown Past" for voice and orchestra: 9 minutes
1951: Piano Concerto No.2: 34 minutes + (Naxos cd)
1953: "Design" for orchestra: 18 minutes
1953/56: "Poems Pour La Paix" for medium voice and strings: 13 minutes
1954-55:"The Poet's Requiem" for soprano, chorus and orchestra: 22 minutes
1956: Symphony No.2: 18 minutes + (Naxos cd)
1957: Sinfonia for orchestral winds + (Albany cd)
1958: Symphony No.3: 24 minutes + (Vox and Naxos cds)
"Pilgrims" for string orchestra: 7 minutes + (Naxos cd)
"Eagles" for orchestra: 9 minutes + (New World cd)
1959-60:Eleven Studies for Eleven Players: 26 minutes + (First Edition cd)
1961: "Ideas" for small orchestra: 13 minutes
1963: "Lions(A Dream)" for orchestra: 14 minutes + (BIS cd)
1964: "Laudemus Tempus Actum" for chorus and orchestra: 3 minutes
1966: "Water Music" for Clarinet, Violin and Orchestra: 17 minutes
"Letters from Paris" for chorus and small orchestra: 25 minutes
"Sun"-eight poems for voice and orchestra: 26 minutes + (Newport Classic cd)
1969: Piano Concerto in Six Movements: 24 minutes + (First Edition cd)
1973: "Little Prayers" for soprano, baritone, chorus and orchestra: 31 minutes
1974: "Air Music: Ten Variations for Orchestra": 30 minutes
1975: "Assembly and Fall" for orchestra: 25 minutes
1977: "Sunday Morning"-Poem in eight parts for orchestra: 21 minutes + (New World cd)
1979: "Remembering Tommy"-Suite in ten movements for cello, piano and orchestra: 22 minutes
1982: "After Long Silence"-Ten Poems for voice, oboe and strings: 24 minutes
1983: Whitman Cantata for men's chorus, twelve brass and timpani: 21 minutes
1984: Violin Concerto: 24 minutes + (DGG and Naxos cds)
An American Oratorio for tenor, chorus and orchestra: 44 minutes
1985: String Symphony: 23 minutes + (New World cd)
Organ Concerto: 25 minutes
1986: "Frolic"-Fanfare for Orchestra: 2 minutes
1987: "The Schuyler Songs"-eight poems for voice and orchestra: 25 minutes
1988: Oratorio "Goodbye My Fancy" for contralto, baritone, chorus and orchestra: 48 minutes
Fantasy and Polka for orchestra
"A Quaker Reader-Eight Movements for small orchestra": 20 minutes
1990: "Swords and Ploughshares" for four solo voices and orchestra: 30 minutes
1991: Piano Concerto for the Left Hand and Orchestra: 34 minutes + (New World cd)
1991-93: Concerto for English Horn and Orchestra: 22 minutes + (New World cd)
1992: Triptych-Three Pieces for Chamber Orchestra: 10 minutes
1995: "More Than A Day" for soprano or counter-tenor and chamber orchestra: 25 minutes
1996: "Waiting" for orchestra: 2 minutes
1997-98:Double Concerto for Violin, Cello and Orchestra: 32 minutes + (Naxos cd)
2002: Cello Concerto: 25 minutes + (Naxos cd)
Flute Concerto: 31 minutes + (Naxos cd)
2003: Mallet Concerto for three mallet instruments and orchestra: 24 minutes
2007: "11 Songs for Susan" for mezzo-soprano and orchestra: 20 minutes
2008: "Songs Old and New" for soprano and chamber orchestra: 20 minutes