In the Us court system, if you are over 70 years of age you MAY be excused from jury duty. The exemption for jurors is at the discretion of the court, and are considered on a individual basis. You must explain the hardship you would be under by attending court.In your case it may be due to ill health or lack of available transport or similar reason.
You will need to produce evidence of this hardship ( doctors certificate if you are ill ) See the source below for more information about jury duty and exemptions.
If you write a letter expressing odd opinions -- such as all misdemeanor offenders should be lashed in public -- you will probably be relieved of your duty. But at 78, a reasonable medical exemption (need to go to the can every ten minutes, for example) should do it.
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