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All these time dilations are relative at a constant speed of movement. For a ship traveling at 0.9 of the speed of light, the deceleration will be visible on the Ground, and from the Ground – on the ship.�
Only accelerations bring the effect you're talking about. The rocket should accelerate to almost the speed of light, decelerate to zero (acceleration again), turn back around and accelerate again to almost the speed of light and then decelerate again near the Ground. All these accelerations will contribute to the fact that you will be older than the astronaut.�
Its trajectory in space-time will be longer, and its proper time will be shorter.
Of course it won't work. The effects of relativity theory are the effects that different reference systems perceive time and space differently. Because there is no absolute space and no absolute time. The simultaneity of events, spatial and temporal intervals are relative and depend on the reference frame. If an astronaut is 10 years old in the Earth's reference frame, then he is 10 years old. On the other hand, 5 years can pass for it, because the distances and times are different for it than for the Earth's reference frame. The Earth will see that the cosmonaut's time is twice as slow, and the cosmonaut will see that the distance between the Earth and the destination has been reduced by half, this is called Lorentz contraction.
I may have misunderstood your question, so please write in the comment section.
I will add and explain my question. We calculated on the Ground how much to fly to the destination and back, without stopping. We found out, for example, that it should fly such a distance in 10 years. We launch it at a very high speed. Will it turn out that the cosmonaut on his watch will fly not 10 years, but for example, 5, and on the clock on earth, not 10, but, for example, 20 years?