Do Star Alliance miles expire?

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6. Can I purchase trip flex after booking?
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Tags

1. #partners
2. #months
3. #after
4. #explorer
5. #credit
6. #expire
7. #united
8. #airlines
9. #delta
10. #never
11. #select
12. #miles
13. #redeem
14. #every
15. #singapore
16. #activity
17. #extend
18. #validity
19. #regardless