I was taught that eligibility is a simple concept, but apparently that's no longer the case. There are no shortage of opinions regarding who is and isn't eligible and why, including several from the courts, bottom to top.
We sure have learned how to complicate things, especially when we just need to twist them enough to get the "correct" answer we're looking for, whether from the Constitution, the Bible, or any other standard.
And a related question concerns who decides the issue. The courts don't seem to want to get involved and the Congress just rubber stamps the decisions of the electors. Maybe it's up to the electors to decide. Maybe it's up to the people to decide when they vote.
It's all become pretty crazy at times.