Bearings can last forever. I wouldn't preemptively replace them.

Recently I've discovered the main cause of bearing failure is impact. Not time or miles. Pot holes basically.

Hit a pothole especially where it torques the wheel sideways and you could damage your wheel bearing in the first mile of driving.

I replaced all four wheel bearings on wife's X5 now (all failed between 130-170.000), but mine has three original and the right front has been replaced twice. (at maybe 150 and 176,000 mi). The left front needs replacing but I couldn't tell until the noisy right was first replaced.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)