YOU SAID:

I am gonna fail my senior year

INTO JAPANESE

私は年老いた年を過ごすつもりです

BACK INTO ENGLISH

I am going to have an old age

INTO JAPANESE

私は年を取るつもりです

BACK INTO ENGLISH

I am getting old.

INTO JAPANESE

私は年を取っています。

BACK INTO ENGLISH

I am old.

INTO JAPANESE

私は老いた

BACK INTO ENGLISH

I am old.