How long do your tires last? Miles...Age ?
I just needed to replace 2 tires on our 06 (3.0), at 54,000 miles the Michelin XVS 4 PLUS that are dated 08 have "cracks" the tires have maybe 20,000 miles and still had fair tread.
I'll replace the other 2 next month....$$$$$...

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BMWCCA # 12660
14 GLK 350 M/B (hatefull POS gone)
05 CLK 500 AMG Cabrio
07 530xiT
09 Boxster