I have a 65gal All Glass Aquarium brand tank which they went out of business in 2000 so it's at least 22 years old if not older and still works fine. Haven't resealed it or anything.
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I'd bet that the glass on my RSM
250 (the original, with curved edges at the front) will last for decades...while the rest of the AIO components, lighting, and stand corrode and rot away around it. That's precisely what's happening to it right now.
Especially if there are a lot of chemicals used and stored in the garage.From what I have heard, the worst thing for a tank is to be empty. Especially if its in a hot garage. The silicone will dry out and fail once filled again. Keep it filled, I wouldn't be surprised if it lasted 10-15 years.
The old Oceanics are pretty much indestructibleI have an Oceanic 90 gallon that I bought used in 1995 and have used it steadily since without issue.