There is a child that is

There is a child that is

There is a child that is 5 years old, 4ft tall, likes toys, is of average intelligence, and believes in santa clause. 40 years pass and the child is now a man 45 years old, 6ft tall, doesn't like toys, is a physicist, and does not believe in santa clause. are the child and the man two distinct beings. or are they the same being? if they are two distinct beings then could the 5 year old child be classified as "dead" since he is now non existent (replaced by a completely different individual).

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