Check that coin again. Kennedy wasn't put on the half dollar until 1964.
Half a dollar
It depends very much on the coin's date. Please check the questions "What is the value of a <date> Kennedy half dollar?". E.g. if your coin is from 1969, look for "What is the value of a 1969 Kennedy half dollar?".
What is the value of this half dollar
No 1963 Kennedy half dollars exist. 1963 is the last year of the Franklin half dollar. 1964 is the first year for Kennedy.
the 1972 Kennedy half dollar is worth 50 cents in circulated condition, or about a dollar in uncirculated condition
50 cents.
.50
50 cents.
50 cents.
50 cents.
The gold plating adds nothing to the value, it's just a half dollar.
If you got it in change, spend it. It's just a half dollar.