SEO means search engine optimization ..

Using this technique you can get higher rank in search engine..

There are two type in seo

1. Onsite optimization
2. Offisite optimization..

There is no any important for good ranking in google or any search engine which site is keyword rich or old domain...

ranking depends on your quality content and your popularity...

hello dear..

You can not find pr backlinks but you can find your sites backlinks using backlinkwatch website....