Expression: "It dates back to 500 years ago."

[Tom]

Hi

Could you please tell me if the following sentence is correct and natural?

[Yankee]

Hi Tom

I'd prefer these:

- It dates back to 1503.
- It dates back 500 (505) years.

Generally speaking, people tend to be a bit less precise when they use the format in the second sentence, so 500 is close enough.
.

[Molly]