i can't get my head around the twin paradox at all. so twins A and B move relative to each other and as a result, according to special relativity, from twin A's perspective twin B will of aged less but from twin B's perspective twin A will of aged less. when they meet up which one will of actually aged less? as far as i can tell the most common answer is that the twins are not symmetric. i.e. if Twin A stays on earth and twin B travels in a spaceship then the paradox is resolved since twin B undergoes acceleration and twin A does not. but what if both twins each get in a space ship and fly in opposite directions, at the same velocity, and travel the same distance, before turning around and coming home?