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Dear Azzam,
you ask an interesting question. This is my veiwpoint. Our bodies are structures which might be thought of as arrangements of atoms or even sub atomic particles. That structure is always undergoing change. Some of those changes are the metabolic activity of being alive, including growth and repair, and others can be regarded as ageing. Such as glycolysis of proteins, free radical damage, telomere shortening, loss of skin collagen and hair pigmentation.
According to the explanatory framework, shown in my essay, each new arrangement replaces the previous. There is only the youngest iteration of the universe. Due to the deleterious changes that can occur to a biological organism, as well as positive growth and repair, with each new iteration I am growing older.Repair is not keeping pace with damage. There is no younger me still in existence in the universe. The me I am in this moment will also be replaced by me in the next. Individual blood cells will be in different places, some cells will have died and new ones will have been formed by cell division. I am not a perfect thing that is unchanging but part of everything in the universe undergoing continual change (whether in form or just in universal position).
What does persist after change has occurred is data that can be processed to form output via the sensory system or artificial detector or sensitive material. That data could be EM radiation in the environment, so a distant observer might percieve an image of me as I was in an earlier iteration of the universe; or the arrangement of pigments on a piece of paper giving a likeness of my former self (photo). Similarly images might persist as a memory, encoded within the neurological structure of an observer.
As you can see from diagram 1. There is no "existing" past other than in records and memories- and pre-written futures that have the potential to become a present experience but are the data generated from former events.That sounds a little complicated because it is a break from our traditional view of the differentiation between past, present and future. However it does allow the paradoxes of relativity and the philosophical red hat problems I discussed to be overcome. You question does make sense to me. There is no you as a fixed and unchanging entity. Nor are you all that you have been spread within a space-time continuum. As a physical presence in the universe you are only what you are in the uni-temporal- Now of Object reality, (preceding the observed present).