Hi, OP! Since you mentioned that it's an old unit, then that might be just the old dust. However, there are several other reasons why there is dust coming from your vent. I highly suggest you have it checked by a professional like Clover Services. Dust coming from your vents can affect your air quality, so it's best to address it as soon as possible.
source https://www.inspectorsjournal.com/topic/18170-dust-from-old-hvac-vents/?do=findComment&comment=175408
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