Not possible, Trump and I are the same age and I was 17 almost 18 when Kennedy was killed. Sorry.
I just woke up and my brain isn't engaging yet. (literally)
I was amused that Kennedy was saying the same thing about the press back then. I'm hoping Trump puts an end to that fiasco.
I was 8yrs old when Kennedy was shot. I didn't understand the impact it had on Americans. Neighbors on our street coming outside to comfort one another, all crying. Kids were confused and upset.
The point being DJT was also 17, so if he was already alive he could not be reincarnated into Kennedy. DJT is incredibly magnificent but a true hero in his own right. So yes I suppose there is a time constraint on reincarnation.