Hi @Mattk69 ,
.,.,.,.,
The Officejet 6500 models was manufactured around 2010 and 2011, so the printer is almost 11 years old.
You can find more information on the back of the printer, if you check the label looking for the Serial Number.
And then following the next serial number explanation:
>> https://www.hpplotter.co.uk/worldofhp/your-designjet-serial-number-explained
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Best regards,
ferRX.

.
@ferRX /
I am a volunteer posting answers on my own time.