They haven't yet. Half dollars don't circulate well and some years and mints are not released for circulation because their not needed by the Federal Banking System.
The years and mints not released for circulation are: 1970D/ 1987P-1987D/ 2001P/ 2002P-2002D/ 2003P-2003D/ 2004P-2004D/ 2006P-2006D/ 2007P-2007D
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No US half dollars were made for general circulation in 1925 but 4 different commemorative half dollars were issued, the type is needed for an assessment. Post new question with a description of the coin.
From 1948/1963 Ben Franklin was on half dollars that were issued for general circulation. Prior to 1948 different depictions of "Miss Liberty" appeared on half dollars.
Kennedy half dollars are still minted for general circulation in Copper-Nickel Clad Copper for circulation while some Proofs (San Francisco Mint {S}) are made in Silver. Check with your favorite federal bank for one or in rolls.
All Kennedy half dollars dated from 1971 to date, struck for general circulation contain no silver and face value only.
The 1974 Kennedy halves are not silver. 1970 is the last year for a 40% silver half dollars made for general circulation. It's 50 cents, just spend it.