Among all the problems related to time travel, a solution is also proposed - that a person can go back during his life or to the future until the day of his death and experience life again (or in advance) but forget everything when he returns to his place. Is this solution free of paradoxes?
Much literature has been written and is being written about time travel in the research field and in the field of science fiction. This is a "wet dream" of many who would like to know what happened in the past, or settle accounts with people who have wronged them. For many others it is a means of escaping from this world to future realms where in their opinion the world is better. This line of thought has a whiff of romance. Is this even possible? Among the variety of possibilities that are discussed in this field, there is a topic that was probably not addressed at all, and that is the biological and cognitive aspect.
If such a man wants to reach time zones in the distant past, then during his journey the hands of the watch he wears will move backwards and in the case of a digital watch the digits will run backwards. Biologically, he goes through a process of grief (becoming younger) and every sentence he says is said from the end to the beginning. From the last letter of the last word he said so far to the first letter of the first word in the sentence. He will stop at the point in time that he set in the time machine. What happens now? He could be younger. Diseases that attacked him this year or another will disappear. He will be a healthy person. Sounds strange and even surreal. Another phenomenon that may happen is that all the memories and the world of knowledge he has accumulated over the years will be erased. They wouldn't actually exist, so what was the point of all this journey?
The same thing happens when you fly into the future. If he reaches a desired future point in time, he learns new things, but when he returns to his real time, this knowledge is also erased. He cannot live in 2013 and have specific knowledge of the year 2125 for example. Another example from a short time span - if a time traveler is 30 years old and he travels 40 years ahead. He may already be ill, he will probably have grandchildren. And if at this age he is sick with amnesia, did he even know that he had to return to the biological age from which he came?
That time traveler upon reaching the point in time he was heading for will encounter a strange phenomenon. He will meet himself. Since he lost all his treasure of knowledge during the trip, all he has left to do is ask himself "If I'm not me, then who am I anyway?".
If these processes do not occur, then his memory is not damaged. It is believed that he actually reached some kind of parallel world. At each point in time, different future bifurcations apply. In one split of time he met one girl and in another split of time he met another girl and in each split she changes a unique dynamic of her life. A time traveler returns to the world of his age with knowledge taken from a parallel world.
The one who thought about this paradox, and mentioned it, albeit briefly, is the late Dr. Nachman Gavoli in the article "Time in a side view” which was published at the time in the newspaper 'Mada' and Fantasia 2000 and survived the printed era until the Hidan site.