If the jury by their unanimous verdict in writing find that sufficient evidence has been presented to them from which it fairly may be presumed that the missing person has met death, and if the judge or magistrate approves the finding, then, after a period of six months has elapsed, the person shall be presumed to be dead and the judge or magistrate shall enter an order to that effect. However, in cases where there is clear and convincing evidence of the presumed death the judge or magistrate may sooner enter the order.