I have 185K on my car, and as far as I know they are original. If I drove more, it is not a daily driver, I would get some good bearings (not Chinese knock offs). When bearings fail and you hear sounds like you are running on snow tires between 30-50 mph, it is obvious that they need replacing.
Another BB'er replaced his front bearings with FAG and noted a 3mpg increase around town! So yes, the wheel bearings do wear out and should be replaced at some time. That time is at your discretion. And, yes, do both sides at the same time.
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Keeping it running is better than buying new
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