old cache? how to remove

i noticed yahoo is still using the old cache of my site. any help on how to get out of it?

 

you can remove this pages but it's will take time (very long time) up to 1-2 years by just updating the robots.txt to disallow this pages.
you can also send error 410 or 404 error.
the best way is to link to it from unimportant site/page so that search engines will try to read this page and received an error.