FLG is on the other side of the political aisle and has issues with most of the responses, but he literally laughed out loud at a suggested response to Sanders being too old is that "he is younger than 4 of the 9 Supreme Court justices."
A few things here:
1) He's younger than less than half of them? Whew! And isn't one of those nine actually no longer living?
2) Comparing somebody's age to the Supreme Court is sorta like saying -- Old? Got a few of names for your Methuselah, Noah, & Shem. Bernie is a spring chicken.
3) Being a Supreme Court justice is anywhere near as demanding as being President of the United States.