YOU SAID:

Find out when you turn 10,000 days old.

INTO JAPANESE

あなたが10,000日を過ぎたときに調べる。

BACK INTO ENGLISH

I will investigate when you have passed 10,000 days.

INTO JAPANESE

あなたが10,000日を過ぎたときに私は調査します。

BACK INTO ENGLISH

I will investigate when you have passed 10,000 days.