Do Xbox Live Gold cards expire if not used?

Related questions

1. What does an Xbox Gold membership get you?
2. Can you get Xbox Live Gold for free?
3. Does Xbox Gold work for all profiles?
4. Do Games with gold expires Xbox one?
5. Does Xbox Live Gold add up?
6. How much is a 12 month Xbox Live Gold membership?
7. Do Xbox Live codes expire?
8. How can I get Xbox Live Gold for cheap?
9. Do Xbox Gold free games expire?
10. Can you play free to play games without Xbox Live?

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