What age do football clubs sign players?

Related questions

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3. How do Premier League loans work?
4. What would Messi transfer fee be?
5. What is Chelsea biggest defeat?
6. Can Premier League clubs loan players outside transfer window?
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Tags

1. #groups
2. #players
3. #player
4. #cater
5. #arsenal
6. #academy
7. #which
8. #years
9. #clubs
10. #least
11. #development
12. #younger