Why don't you feel older when traveling at the speed of light?

noblegas
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According to the twin parodox scenario, when a twin goes in a rocketship and it travels near the speed of light and come back toearth with his now older twin brother at a speed far from the speed of light , his surroundings suddenly seems like they aged greatly , including his twin brother. While he was been traveling near the speed of light , his surroundings exactly appeared as it did as he departed from the Earth before his rocketship reached the speed of light . If his surroundings suddenly seemed liked they age as his rocketship slows down to the to a speed far away from the speed of light, why doesn't he age as well as his brother who was on Earth the whole time?
 
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