If those domains actually had content on them and are still live sites, then yes, it could be worth keeping. As long as you keep the site(s) live. But just bec

If those domains actually had content on them and are still live sites, then yes, it could be worth keeping. As long as you keep the site(s) live. But just because a domain name is 10-12 years old, if it never had content and links, doesn't mean it's valuable. A pieceofjunkkeywordkeywordkeywordnonsense.com domain name, even if it's 10-12 years old, is still worthless and only valuable to you.