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All answers having "--- youth" as clue:

3 Character Answers:

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ASA

BOY

KID

LAD

TOT



4 Character Answers:

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TEEN

VIEW



5 Character Answers:

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MINOR

PRIME

SPRIG

TEENS



6 Character Answers:

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HOSTEL

TEENER



7 Character Answers:

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ASPIRIN

SAPLING



8 Character Answers:

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TEENAGER



9 Character Answers:

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CHILDHOOD

JUVENILES

SALADDAYS

STRIPLING

YOUNGSTER



10 Character Answers:

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FOUNTAINOF

SPRINGTIME

STRIPLINGS

YOUNGBLOOD



11 Character Answers:

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ADOLESCENCE