Articles for Seniors web site

I am looking for someone to compile / write articles related to a list of different keywords relating to seniors. I will provide the keyword sets and key word density ranges. These articles are for creating content-rich pages to place on a seniors related website for the purpose of improving search engine rankings for the entire site. I am interested in creating 10 - 30 one page articles, ranging between 200 - 800 words per article, containing the various keyword sets and densities identified by me (some flexibility here) The content can be found / borrowed / and compiled from other web sources and does not have to be grammatically or structurally perfect - just have keywords in the headlines and throughout the articles. Again - more for search engines than visitors. Project price is dependent on quantity of articles, or the size of the collection. I am willing to pay $5 / article, with a 10 article minimum ($50 / 10 articles) Applicable copyright laws must be adhered to as articles must be publishable as original.