The Ideal Work History
If you are man or woman who has a long history in the work force, then you should go back 10 to 15 years when writing your resume's work history section. This length of time gives a potential employer a good look at your long-term performance and habits as a worker.
New to the Work Force
Of course, you may be younger and less experienced and will, therefore, not have the ideal 10 to 15 years. If your work history is shorter, just include all the experience you do have. Employers will expect to receive resumes from many applicants for whom the 10 to 15 year guideline does not apply.
If you have more than 15 years experience, then stick to 10 to 15 years of work history on your resume. If you are less experienced, then just include the work history you do have.