How did we determine that the sun is ~4.6 billions years old?

Question

I love astronomy stuff, not an expert at all, but have always been so fascinated by it. I am totally baffled by how we seem to claim that we can approximate how long the sun has been around. Like the margin of error for a number like that is crazy…. totally incomprehensible to me. Say that we are 25% off, that means we are over 1 billion years off. So, how do people confidently claim that the sun is 4.6 billion years, rather than 3 billion or 10 billion?

In: 1140

Answer 1

I understand this is eli5 but what youre asking is covered in high school physics and you keep doubting the responses youre getting. nuclear and astrophysics allows scientists to accurately date stellar objects.