Stars are at a distance of 50 to 70 light years away from earth. If a ray of light starts from a particular STAR ( say any one of the 27 identified stars) simultaneously when a child is born at the earth, that ray will reach earth when then that child attains the age of 50 to 70 years . Who knows that, at the time the ray of light of the birth star reaches the earth the native ( the child /man/woman ) might have even died.