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.
 
I see… I’m still on my original AL tank on my 2013 225 freedom….so far so good fwiw
 
You're chasing the Santa Cause dream of GW ownership and for that matter any 20+ year old boat! Truth is they are all sinking...only difference is how fast! They need TLC and $$$.

For my 1997 268 Islander I did fuel tanks a couple of years ago. Just finished a transom last week. Refinished hardtop and tower. Boat is like new!
 
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