From what I read the Jet Blue lounge has closed at Terminal 5 at JFK...do I have any other options to
visit another lounge at other terminals if I am leaving out of Terminal 5..I have American Express Platinum card as well as the Priority
Lounge pass. We have about 4 hours before our plane leaves. Thanks for any help

We have Priority Pass and I believe we used the lounge in terminal 4 last September. I know we had to walk a bit to get to our gate, we were flying international on Delta. The lounge was very nice, we had several hours to kill and found it comfortable with a nice selection of both food and drink.

But will security at terminal 4 let me in if I don't have a boarding for terminal 4 but have one for Terminal 5???

You won’t be able to use the Delta lounge unless you are flying Delta, so it may not matter. I think you may be out of luck at Terminsl 5.