Those who die before their prescribed time do not really die and become extinct. (They should not be considered or referred to as dead). They would always remain alive because they have been enlivened before the Resurrection by becoming assimilated in Allah.
So that let him perish the person who has already perished after a sign and let him live the person who already lived after a sign. (42, AI-Anfal).
ہر کہ اندر وجہ ما باشد فنا کل شی ھالک نبود روا
(Roomi)
He who loses himself in Our Existence, is no more subject to the Law of Universal mortality.

Those who de before their death, are immortal made,
They will live ever, for them there will be no death.

Those who died before they were to die, are not defeated by death,
They will live on, who lived before living.