An issue that has been hanging over the Democratic Party is the reality that two of the top candidates–former Vice President Joe Biden and Vermont Senator Bernie Sanders–would reach the age of 80 within two years or one year respectively of taking the oath as President.
Very few leaders of nations are ever in office in their 80s, and the pressure and stress of the job is such that one has to be concerned about the health effects on an octogenarian.
It is true that based on estimates by life insurance companies, a person in the late 70s might live up to ten years, but the burden of the Presidency is not the ordinary kind of life that people at that age usually have to deal with.
So it is perfectly fine for a person in the late 70s or higher to work, and even to be a member of Congress or the federal courts, but no job in government is quite like the Presidency.
So this author and blogger has problems and concerns about either Joe Biden, who he greatly admires and always has, and Bernie Sanders, someone he is not as enthusiastic about, facing the Presidency at their age.
It seems far better that someone much younger be the nominee and the next President, although Elizabeth Warren at age 71 at the time of the election does have the edge of seven to eight years on Biden and Sanders, although she would be a year older than Donald Trump when taking the oath office, so not ideal either.