The life a spring depends on a ton of factors - some of which are its quality, road conditions where you drive, how you drive, the weight of the car, and how well damped it is. I'd say after 100K they are probably a little tired. I have only heard of 1 Mustang that actually broke a spring - the stock one gave out at about 160K on a friend's 5.0.
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Strike down the unroadworthy!
2000 GT Atl. Blue: '03 Cobra motor - 465rwhp/473rwtq, T-56 6-speed, full MM TA/PH & tubular K-member suspension, Saleen body, 17" Torq-Thrust II's, M/T ET Street radials, and lots more
'94 Rio Red Cobra: All the bolt-ons, 3.73s
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