system
Given the following post, respond as if you're commenting on Reddit:
human
CMV I think that US supreme court justices should have a limit to the number of years they can hold the office.

For those unfamiliar with what exactly the supreme court justices do, their primary responsibility is to judge whether federal bills are constitutional. 

Very little of their time is spent hearing high profile law cases. But still these cases are used as precedence for decades of other cases.

The 9 justices are one of the last lines of defense for a bill to become a law. Collectively, they hold quite a bit of power in the American legal system. 

5 of the 9 supreme court justices have held the office for more than 20 years.

20+ years ago nobody could have predicted the technological changes that occurred. Though these justices may have been good choices during the cold war, there may be better options available.
gpt
The job of the Supreme Court is not to make law. They are not even in the branch of the government that handles the bills and how they are made into law. They do not touch things when they are in bill form and are not the "last line of defense" before something becomes law.

What they do is they determine if a law is constitutional when that law is challenged after it is made. As such they have absolutely no need to have knowledge or the ability to calculate technological change or future events. All that concerns them is previous legal precedence and the constitution. So because of that them having massive amounts of experience in their job is what is most important.