YOU SAID:

I wish I knew what I know now, when I was younger..

INTO JAPANESE

私が若かったときに、今知っていることを知っていればいいのに…。

BACK INTO ENGLISH

I wish I knew what I knew when I was young.

INTO JAPANESE

私が若かった頃に知っていたことを知りたい。

BACK INTO ENGLISH

I want to know what I knew when I was young.

INTO JAPANESE

若い頃に知っていたことを知りたい。

BACK INTO ENGLISH

I want to know what I knew when I was young.