It is said that you should go 15 years back on your resume. This is according to the rules of thumb in which some experts still indicate that ten years would be the cut off. Therefore, figure out how much of your career should show up on your resume.
Typically 10 years is the safest bet, however if you have education and military experience those should never drop off the resume. If it is relevant to your prospective job opportunity than you need to include it.