What is the oldest star(s) that you have come across?

Question: What is the oldest star(s) that you have come across?
- Keywords:
  old,
  star
Asked by Woody to Stephen on 12 Mar 2018.
- Stephen Wilkins answered on 12 Mar 2018:
  
  I’ve found galaxies that we’re seeing when the Universe was only a few hundred million years old (~5% of its current age). There are stars in the Milky Way which have been around for roughly the same amount of time.

Question: What is the oldest star(s) that you have come across?