If you plan on taking long road trips then I would swap it out so you don't get stranded (or have to limp to a dealer which happened to me at 75k miles while 3 states away from home).
If you drive short trips in your area, then replace when it dies. You will usually get a little warning such as the cooling fans running on high for no apparent reason.
On my cars, the WP died at 60k and 75k miles.
When I sold my 335, it had 110k miles and original pump.
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