When asked what the most difficult job in the world is, many might jump to conclude doctors or rocket scientists. While the question is subjective, often times, the most challenging job is running a country. Being the President of the United States is a tough job that seems to be only getting more difficult as each term goes by. With seemingly endless resources to run a country, time and age are two things not even a president can overcome. Here we have 10 comparisons that are proof of that.