One of advantages of being an older worker (lots of experience), can also play havoc with a resume, especially in a field that typically skews to younger people.  The good news: recruiters tend to prefer older workers over younger for their stability (average length of stay for younger worker is 26 months).  Here are a few tips from an IT specialist on how to create a resume that brings out your best for the job you’re after in any field.  

• Prune that resume down to the essentials!  If you’re 50 or better, it probably reads more like a book than a document designed to get you that interview.  You’re likely competing with younger folks, so let the points be crisp and compelling.      
•  Focus on 3-4 core skills that are directly relevant to the job you’re seeking.  Think of your resume as a work in progress and be prepared to customize it quickly.  Obvious point: check grammar and proof for typos every time you change and reprint it.
• Skip any certifications, expertise or accomplishments that ‘date’ you.  After you get a feel for the work at hand, you can always bring them up during the interview. 
• Smartest tip we’ve seen anywhere: ask people in the field you’re interested in to critique your resume.  They’re much more likely to see the red flags that could mean your resume winds up in the trash.   
• Be confident.  The workplace is changing in your favor.  According to AARP, by 2012 almost 20 percent of the U.S. work force will be 44 or over. Americans are predicted to work longer than ever before. There were 5.5 million people 65 and older in the labor force in 2006, according to the U.S. Census Bureau, a number which is projected to reach 10.1 million by 2016.

http://blogs.techrepublic.com.com/tech-manager/?p=515

http://www.eweek.com/c/a/Careers/Tips-for-Older-IT-Job-Seekers/