Sway bars wear out like springs, but it takes a while and a lot of mileage. And depending on the daily driving conditions (ie urban v rural) each mile is different in every application. At worst, he didn't do such a good job explaining the problem.

With that said, I have a free 1994 wagon front swaybar for you if you want it. Only had 67K miles on it when it was taken off. All you do is pay for shipping.

PM me if interested.