Why you should not vote for 70 year old presidential candidates

Why is it that a bunch of septuagenarians are coming forward to lead the US? On the Republican side we have 73 year old Donald Trump while on the Democratic ticket, three of the top 5 candidates will be their 70s on inauguration day. These individuals are, at least, 3 years older than the revised retirement age in the US. Looking at it from another angle, all of them were born before 1950. Are these the top people the United States of America can put forward to take the country towards the challenges that it faces and are they the best choice we…