I know they were inspected but the general limit is about 6 years for tires. If the car is 9 years old, the tires could be older. Look on the sidewalls determine the month and year of manufacture and then decide if you want to trust you safety to them.
I suspect, if the tires have decent tread, at least the rears aren't original. Typical Boxsters don't go 25k on the rear tires unless they are aligned to max tire wear as opposed to max traction.
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