YOU SAID:

Seems like this will get old fast

INTO JAPANESE

古くなるのが早いみたい

BACK INTO ENGLISH

Looks like they're getting old fast.

INTO JAPANESE

彼らは早く老化しているようです。

BACK INTO ENGLISH

They seem to be aging fast.

INTO JAPANESE

彼らは老化が早いようだ。

BACK INTO ENGLISH

They seem to be aging fast.