I got a few more years out of mine. The question is how do you know if yours will make it. A couple of things to look for/keep an eye on. First tilt the motor up and have a robust friend put pressure on the end of the lower unit, while you watch the transom. If you can detect any flex then I would be very cautious, once movement starts it can progress pretty fast. Look carefully at the outer edges of the transom, under where the lifting rings are, if you see hairline cracks running vertically, then I would say you are done. On mine when I saw the cracks running almost top to bottom on the outer edge, almost at the corner I knew it was past time. When I got into it that was confirmed.
By the way this was on an original 1975 transom. If yours has been molested previously, your situation may be different. This is just one guys opinion on the internet, and I have only done one transom. Many on here have done multiples and might have some additional thoughts.
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