bcredliner
You are probably closer to yours and my life span but in stop and go traffic, heavy right foot, first off the light and last to stop driving mentality i see lots gone or worn at 40-50K. On my own front and rear arms, fronts at 43K and rear now at 60K (Rear are being done as preventive) along with the brake upgrades/rebuilds.

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2005 X5 4.8IS
The Blue ones are always FASTER....

Current Garage:
2005 X5 4.8is
2002 M5 TiSilver
2003 525iT
1998 528i
Former Garage Stable Highlights
2004 325XiT Sport
1973 De Tomaso Pantera, L Model
1970 Dodge Challenger T/A 4 sp Alpine White
1970 Dodge Challenger T/A 4 sp GoManGo Green
1971 Dart Sport, “Dart Light” package
1969 Road Runner 383
1968 Ply Barracuda 340S FB Sea-foam Green