Einstein's Theory of Special Relativity dictates that, it's possible to be older or younger than your twin because time can take faster or slower dependent on how you're moving. According to the first postulate of Special Relativity the laws of physics are the identical for everyone's viewpoint while in uniform motion. The second postulate states that vacuum speed of light is the same for all observers. Here, in the video below, is the simple explanation of twin paradox, so watch and learn:
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