When building your links, consider that an older link is going to be considered the better link. This shows that the site that is linking to you STILL finds you relevant. Obviously, this is good. New links are great, and will someday be old links (we hope). However, be careful when adding links… too many at once raises red flags and could imply that you are buying them. (Which Google feels is bad.)
Tags: bad seo, good seo, inbound links, SEO Tips