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What can you do about old website URLs that are still indexed by Google?
I received this question recently:

I was just contacting you to ask you about some of the links from my original website. When I put my name into a search engine quite a few pages from my original website come up like the news page etc and when you click on these it does take you to my new site with a page not found message. I was wondering what I should do about this, is there a way to stop these results showing? It isn’t too bad as someone could still go to the links and get to active pages but I was a little worried that it could send people away. I am hoping you may be able to help?