The SSA will determine if you can still do your past relevant work by examining all jobs you have done for the past 15 years. But, even if you cannot do your past work, you may still not win if the SSA determines that you should be able to do “other work” considering your age, education, and work experience. The SSA is responsible for providing evidence demonstrating that “other work” exists in significant numbers in the national economy that you can do.