Google likes web pages with a long history, as we know. But the “strength” of long-established pages in the Google results doesn’t have to die with them. It can be transferred elsewhere, if you know how. That’s just one reason why you should never delete old pages on your website – instead just “301 redirect” them to any replacements.
Sometimes I visit a website and the whole thing is gone – maybe the company closed down, or the website owner gave up. I nearly always think: “if only I’d known!”. If they’d have let me, I’d have taken the best content of that website and put it on my site, and redirected all the link “strength” built up over the years.
Keep an eye open. You never know when you might come across something being deleted from the web which could be quite valuable.