Oldest a used Grady can be while not having to worry about fuel tank/tanks replacement.

There's really no answer to this. It all depends on where the boat was used, how it was cared for, how/where it was stored, how good the maintenance has been on the floor hatch and such.

The ONLY way to know is to inspect it, which is pretty easy.
 
I had a 99 192 until 2025 with the original plastic tank. Never had any issues. I did replace all the fuel hoses around 2018-2019, but the tank was still going strong when it sold last year.
 
FYI, I made an assumption that the OP was referring to an aluminum tank... But, Gulf, you're right - he didn't say what he has. Plastic is of less concern and Al.
 
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