If you leave earth at the age of 15 in a spaceship at Speed of light and spends 5 years in space, when you get back on earth you will 20 years old. But your friends who were 15 when you left, will be 65 years old at that time.....

If you leave earth at the age of 15 in a spaceship at Speed of light and spends 5 years in space, when you get back on earth you will 20 years old. But your friends who were 15 when you left, will be 65 years old at that time.....