Changing Title tags and META tags.

Question:

In your opinion, what effect, if any, will changing the title tag and META keyword and description tag have on a site? Specifically, if the site is around 5 years old, PR6 and the tags have not been modified ever.

Of course, thorough thought and ample research would have gone into the new content for title, keyword and description.

I am looking forward to your replies.

If your search engine traffic is coming from Google then you shouldn't worry as Google is not ranking sites based on the descriptions or keywords, but it is using your description in their SERPs. That means that you may be in the same SERPs but have lower or higher number of clicks to your site.

This is something that worths to test, especially in a site that nothing changed for a lot of time :)

I changed the page title form some website because we got results for "trampolines" and we wanted results for "trampoline".

the result: it took some weeks to get results for the new situation.

I wonder if since the pages haven't been changed in so long that by changing them - even a little, that would encourage the search engines to spider the site a bit more. I notice when the spiders are not finding anything new that they start to visit the site less frequently. And when the frequency really drops down the site starts sinking a bit in the SERPs. (I recently realized this was happening with one of my sites and just a bit of work has it regaining some of the position it had lost.)

It might be worth it to make some changes to give the spiders something new to see.

I think the spider will give you new positions if the new titel is still related to the content...