Then that's weird for a site as old as yours.
Oh, I know that. My posts are all indexed, I always add them to GSC after I publish and they are indexed very quickly. But, I don't know how to check are my backlinks indexed if they are not appearing in GSC (only 2 backlinks appeared in GSC so far from many).Then that's weird for a site as old as yours.
To check whether your links are indexed on Big G, just use this operator: site:link
For example, here's how to check whether this thread has been indexed on Google:
site:https://www.blackhatworld.com/seo/backlinks-in-ahrefs.1260611/
It's already indexed!
That's what you also do for the links you've created if you want to verify they are indexed.
ah, ok, thanks! How should I find the backlinks that are not indexed? I mean, I don't remember locations of some...
No way to know that.