Mine are pretty high mileage. I will have to check my records to say how high but I think 80K. And mine are perfectly non warped. There are a LOT of theories on this subject. It seems some are just bad and some are good. You can get them fairly cheap here or at germanstar.net etc. So I would just replace them and hope for the best.

Mike

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra