Search Console URL Errors for 10 year old URLS

[ichthyous]

I recently launch a new website which replaced my old 10 year old website. I had approximately 3,000 301 redirects from old pages to new pages, and I have tested them and fixed any pages that were not properly redirected. Google Search Console is showing 500 404 pages today and in going through them I realize that they are mostly old urls that were redirected in my old .htaccess file. In most cases the urls have been redirected for years, and a good number of them for 10 years! Why is google continuing to request pages that haven't existed for a decade? Is this normal behavior...all of the status codes are 301---200 OK. Anyone else see this behavior and is it safe to ignore those requests?

[JesterMagic]

I can't say any of my 404 error links are 10 years old (and none of them are from redirects because I only have a few) but some are at least 4 or 5 years and Google still requests them every now and then even with a proper 404 error code. Most at some point I have marked them fixed in the console and Google still returns.

I gave up worrying about them.