its an interesting link of spirituality with biology.......but as we do know most of the body cells have the division power of up to 50 times and to that point of replication halt is because chromosomes lose its telomers and with out telomers cell replication cant pass the check-posts of cell division....if it is possible to be new us after 7 years it would have been superb like after the said time we would be having fresh brain as well:):)