If the domain is clean and related to your niche, then you can buy it. Depending on site trust, it may help to reduce the sandbox period. As you mentioned it is aged domain with no backlinks, so age factor gives only very small impact to your site. If that site has gained good authority and with backlinks then i think it will be extra benefit to site. But not worry, If you keep posting good content frequently and pointing quality links without spamming the site. Gradually It will help you to rank and yes it will take some solid time.