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I would think your windows should still be fine. I guess the best way to determine if it is worth replacing them is to do a cost benefit analysis. What will it cost to replace them? How much money will it save you (power consumption, heat loss, etc)? Are the new features worth the cost to you. Yes the new windows might be nicer, but are they nicer in a way that will benefit you? If not, then I might spend the money elsewhere!
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