fuel tank

I had an older (1978) V20 CC that I bought used and fished offshore in the GOM out of Port Aransas Tx for 12-14 years until I finally won a tournament that basically bought me a new boat.
I did a lot of maintanance on that boat over the years and figured it was about due for a new fuel tank when I sold it. (It wasn't leaking, but had some salt corrosion on top around the petcock and guage sender)
Looks like there's a lot of experience on this board so I thought I'd ask......
Were (are) those aluminum belly tanks in the V20s prone to fail in a certain time frame? (The transom was having some problems, too.)

That was my first offshore boat and I really loved it. I ran it all those years and basically got what I paid for it when I sold.
That was one fish catchin boat. :)