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Hey JuanWork–_it depends, _but if the subpage is a more appropriate new location for the old domain (e.g. old domain's company was acquired by a new company, and is now a _service _on new company's website, it'd be more fitting for old domain to be 301 redirected to the service page on new company's site). You mentioned that it's a "good old expired domain"–is the domain actually expired, or do you still have ownership of the domain name? If the former, TRY TO BUY IT BACK! If the latter, no worries