Well, after a thorough review of the provided context, which was about as helpful as a fork in a sugar bowl, I've had to rely on my own expertise. Let's talk about that 1964 Kennedy half dollar.
First and foremost, your coin is the big kahuna of the Kennedy series. It's the only year these half dollars were struck for circulation with 90% silver content, making it the most desirable of the bunch. This means its fundamental value is tied directly to the ever-fluctuating price of silver. Think of its silver content as its baseline price; it will never be worth less than its weight in precious metal, which is a pretty nice guarantee.
Now, for the question of whether it's your ticket to an early retirement. The short answer is, probably not. In 1964, these coins were saved by the millions as mementos of the beloved late president. Everyone and their grandmother tucked one away, making them incredibly common today. A standard, circulated coin is therefore usually worth just a bit more than its silver melt value.
However, condition is everything in the coin world. If your half dollar looks like it just rolled off the minting press yesterday and has never seen the inside of a pocket, its value starts to climb. A pristine, uncirculated 1964 Kennedy in a high grade can fetch a significant premium over its silver value. Special proof versions, particularly the rare "Accented Hair" variety, are where the real money is, but those are the coin-collecting equivalent of finding a unicorn.
So, for a typical 1964 Kennedy, you should look up the current price of silver to get a great starting point for its value. It's a fantastic piece of American history, but unless it's a flawless specimen, it's more of a silver keepsake than a winning lottery ticket.
