In December 2007, Google rolled out the new ga.js page tag which they recommend to use for all new accounts and new profiles for new domains. Existing urchin.js page tags will continue to work, nevertheless the new tag will allow site owners to take advantage of the most up-to-date tracking functionality, ability to graph multiple data points at once and to track ecommerce transactions in a more readable way
I am not sure how old is google analytics. I remember actually google analytics is acquired by google from another company . I forget the company name and the name of former google analytics .