The Twin Paradox involves 2 observers, usually twins. Let them be named A and B. A remains at rest in the same reference frame as Earth while B is in a separate reference frame moving at velocity v, close to the speed of light, from A. After a certain amount of time, B switches reference frames to another which moves at the same speed but in the opposite direction, towards A.
Generally, we would say that due to time dilation, B would have aged less than A. However, consider the case where B is stationary and that the Earth together with A are moving similarly and changing reference frames. In this case, A would have aged less than B.
These 2 cases should both be equally valid through the observations of A and B. However, this would cause a contradiction in how they have experienced time.
Please enlighten me on how this is resolved where A ages more than B. I would like to find out if I have made any misconceptions in my understanding.
