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Well it is possible
After all David Icke claims that Prince Phil is a shape shifting lizard ( you can see the resemblance) from another planet. Lizards can live a very long time.
I've noticed that sometimes he's Princess Anne and also Ali G!
Considering PP's age that is a distinct possibility.
If he does we will say 'how clever you were right' if he doesn't we will do what the newspapers do with predictions and conveniently forget about those which were incorrect