As nations honored their war veterans on Friday — Armistice Day and Veterans Day —a 19-year-old in California is trying to preserve as many voices of World War II veterans in the United States as he can.

Many of the veterans are in their twilight years, with ages in the late 80s and the 90s. The teenager, Rishi Sharma, has started a nonprofit organization, Heroes of the Second World War, to record video interviews with them for posterity.

Of the 16 million Americans who served in World War II, about 620,000 are still alive, and 372 die each day, according to the National World War II Museum.