YOU SAID:

when you become an adult you become a grown child in the outside and in

INTO JAPANESE

大人になると、外でも内でも大人になります

BACK INTO ENGLISH

As an adult, you become an adult both outside and inside

INTO JAPANESE

大人になると内外の大人になる。

BACK INTO ENGLISH

When you grow up, you become an adult inside and outside.

INTO JAPANESE

大人になると、内外で大人になる。

BACK INTO ENGLISH

When you grow up, you grow up inside and outside.

INTO JAPANESE

大人になると内外で成長する。

BACK INTO ENGLISH

When you grow up, you grow up inside and outside.