YOU SAID:

in 100 years I will be very old

INTO JAPANESE

100年で私はとても年を取ります

BACK INTO ENGLISH

In 100 years i get very old

INTO JAPANESE

100年で私はとても年を取りました

BACK INTO ENGLISH

In 100 years i was very old

INTO JAPANESE

100年で私はとても年をとっていました

BACK INTO ENGLISH

In 100 years i was very old