YOU SAID:

if you're under 20 and depressed

INTO JAPANESE

あなたが20歳未満で落ち込んでいる場合

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If you are depressed under 20

INTO JAPANESE

20歳未満の場合は

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If you are under 20 years old

INTO JAPANESE

20歳未満の方

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Under 20 years old

INTO JAPANESE

20歳未満

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Younger than 20

INTO JAPANESE

20歳未満

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Younger than 20