-Removed-Yup, YouTube is a belly full.
These are interesting, thought experiments, but I do not believe they have any bearing on either the age of the universe, or on our calculation of the age of the universe. These thought experiments apply not to the passage of time throughout the entire universe, but only to the experience of time for an observer locally, or for some observer relative to some traveler locally . calculations of the age of the universe are based on measurements of the speed at which galaxies are receding, not only from us, but also from each other. Even if some galaxy traveling at near light speed away from us were to reverse course and travel towards us at near lightspeed, these relativistic effects regarding the experience of time would apply only to sentient beings within that galaxy, not to the expansion of the entire universe.
