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What if you have two twins equally distant from a point in space and completely at rest relative to each other. At the same moment they both accelerate to 0.99c and then travel at a constant speed to the midpoint. From each of their points of view the other is moving quickly towards him and aging slower. They both decelerate as they near each other and come to a complete stop at the midpoint. They finally pass each other going in the opposite direction and glance at each other through their spaceship windows. How can each see the other as being younger? What if they decelerated and came to a stop at the midpoint? Who is older/younger? Both experienced the same acceleration. Both, then travelling at a constant speed deemed that the other was moving relative to them so each thought the other's clock is slower.