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How accurate is a Y-dna test at age 78?

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    $\begingroup$ For those who VTC -- I'm just wondering, how is this question seeking medical advice? The OP simply asks if the Y chromosome is vulnerable to aging, and, how accurate Y-DNA testing is.. Nothing about this question has to do with medicine, but instead, lies within general biology/genetics. $\endgroup$ – Charles Jan 3 '18 at 14:08
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    $\begingroup$ On the other hand, if you want to VTC due to lack of effort on the OPs part, to answer their own question, then I may agree with you.. $\endgroup$ – Charles Jan 3 '18 at 14:10
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    $\begingroup$ Your Y-chromosome most likely isn't the exact same as it was 60 years ago, however, this isn't such a big deal since the Y-chromosome is some 60 million base pairs long. Generally speaking, the accuracy of a Y-DNA test is influenced by the type, and number, of markers used. That being said, age shouldn't diminish test result accuracy. $\endgroup$ – Charles Jan 3 '18 at 14:42
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By and large, yes. Some telomeres might be shorter, but the rest of the sequence will not change. Certainly, any regions used for ancestry testing will be stable.

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