Looking at https://aviation.stackexchange.com, there's a question asked by me six years ago showing that it had an edit applied 2 days ago by user Hartley.
When I saw this, I was curious to see what the edit was. I couldn't see anything by just scanning the question, so I tried pressing the EDIT link on the question; when I do that, the dropdown at the top of that page shows one edit from six years ago. So why does the question show 'last activity' 2 days ago?