Do Oyster cards expire?

Related questions

1. Can I use Oyster app instead of card?
2. Can you use your phone as an Oyster card?
3. Are oysters alive when you eat them raw?
4. Is Oyster cheaper than contactless?
5. What are the odds of finding a pearl in an oyster?
6. Why then the world is mine oyster?
7. Does London Pass include Oyster card?
8. Is Oyster card refundable?
9. Do all oysters have pearls?
10. Is my oyster?

Tags

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2. #remaining
3. #oyster
4. #added
5. #balance
6. #equates
7. #customers
8. #deposit
9. #refund
10. #cards
11. #transport
12. #revenue
13. #expire
14. #their
15. #return