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Ah, that's a fair question. However, most people do not get a shot every year for 70+ years. Most people don't get them as healthy adults. Plus, the flu vaccine may not even have Thimerosal.

Here's some CDC info on the subject.

Does the influenza vaccine contain thimerosal?

Yes, the majority of influenza vaccines distributed in the United States currently contain thimerosal as a preservative. However, some contain only trace amounts of thimerosal and are considered by the Food and Drug Administration (FDA) to be preservative-free. Manufacturers of preservative-free flu vaccine use thimerosal early in the manufacturing process. The thimerosal gets diluted as the vaccine goes through the steps in processing. By the end of the manufacturing process there is not enough thimerosal left in the vaccine to act as a preservative and the vaccine is labeled ‘preservative-free’.

Can I get an influenza vaccine that does not contain thimerosal?

For the 2002-2003 flu season, a limited number of individually packaged doses of preservative free, reduced thimerosal-content influenza vaccine are available from Evans Vaccines and Aventis Pasteur. The Evans reduced thimerosal-content vaccine is approved for use in persons over the age of 3 years. In September 2002, the FDA approved Aventis Pasteur’s Fluzone® Preservative-free: Pediatric Dose, Influenza Virus Vaccine for use in children 6 months of age and older. Fluzone® is packaged in 0.25 ml dose syringes for persons under 3 years of age, and in 0.50 ml dose syringes for persons 3 years and older (including pregnant women).