Page speed as a ranking factor?

Marketing
1

“Google counts page speed as a ranking factor”
Is it so…?

Also I read some where “Age of web page” is another ranking factor as per Google’s Algorithm.

Please let me know some of the important ranking factors to be taken into consideration.

2

Have a look at http://googlewebmastercentral.blogspot.com/2010/04/using-site-speed-in-web-search-ranking.html & http://www.seomoz.org/article/search-ranking-factors#ranking-factors