up to what year are half dollars silver

[OArcher]

Based on the provided information, the silver content of United States half dollars was phased out over several years. The last year for a half dollar to be composed of 90% silver was 1964. This applies to all U.S. half dollars minted in or before that year, including the first issue of the Kennedy Half Dollar.

Following this, a period of reduced silver content began. From 1965 through 1970, Kennedy Half Dollars were produced with a 40% silver composition. Therefore, the year 1970 marks the final year that any half dollars intended for general circulation contained silver.

Beginning in 1971, the United States Mint completely eliminated silver from circulating half dollars, switching to a copper-nickel clad composition. It is important to note, however, that the U.S. Mint has produced special silver proof sets for collectors since 1992 which contain half dollars made of 90% or 99.9% silver, but these were not intended for general circulation.