Look up birthdays and towns where people live.

http://www.ussearch.com/

So you are trying to reach a person from a older copy of their resume. The phone doesn't work and the email bounces back and you may find a linkedin profile on the person but they no longer work at the company in their linkedin profile. But you can pretty much guess within a few years how old they may be based upon the data on their resume. I use this site to search for the person's name, in the state they most likely live in and enter their estimated age. This website can usually give me a few other towns where they may reside and then I do a www.pipl.com search to get their phone number or I go to the lycos site to track them down in the directory.