Re expired domain backlinks

If a domain expires, then its age is theoretically reset, right?

However, what about the links?Is their age getting a reset too?

So, for instance, if a domain has Referring domains = 45, then are these backlinks counted as fresh when I'll register it?

What if I'd build a brand new domain with 45 RD of the same quality in a day, will it have the same impact?

If the domain expired and within 30 days you register domain back then it will not effect the age of the Domain.

If your register after 30 days .... google consider it as a new domain

The number of days after which Google resets the domain is not set in stone. A rough guide is: does the old content still rank/is indexed in Google? If yes, there is a good chance that the link profile isn't reset. Unfortunately, there is no fool-proof method to determine this in advance.

Btw, we're talking about a domain's link profile, not its age. The "age of a domain" means nothing to Google and is not relevant for SEO. It's the indexed content that matters. So, if you want to benefit from the "domain's age", make sure you keep the old URLs intact.

Domain age is usually a selling point for domain sellers

That's pretty much their only relevance

You should focus more on the backlink EQUITY of a domain

Wrong and wrong and wrong and wrong.

Domain age matters fuckall. The only reason why would domain age matter is, if you planned to rebuild the site to its previous state. In that case you would need the content to still be indexed. Google cares about the age of the content. The age of the domain itself does not matter.

Regarding backlinks, they are not counted as new, they have always been pointing to the website. And no, building 45 new backlinks in a day definitely won't have a same effect.