17 May 06
06 Aug 12 3:25 am
Depends when you are going to change your site. In the next couple of weeks, or 6 months? I don't think it's going to have that much effect but it depends how much you changing the site, if you change the urls then it wont help.
I would add your site to Google Webmaster Tools, add Google Analytics and submit a sitemap of the current pages, this way Google is going to crawl your site and will set the base for the age (if they haven't crawled already - Matt Cutts said they base it off when they first crawled).
Once done, make the website changes and then buy a package, by then you might of saved another $10 so you can purchase the $25 :)
Make sure to submit another sitemap once you've done with your site change.