Astronaut benny travels to vega the fifth brightest star in, Ask an Expert

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Astronaut Benny travels to Vega, the fifth brightest star in the night sky, leaving his 35.0-year-old twin sister Jenny behind on Earth. Benny travels by a speed of 0.9996 c, and Vega is 25.3 light-years from Earth.

How much does Benny age when he arrives at Vega (in months)?

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