YOU SAID:

i'm the oldest in this room

INTO JAPANESE

私はこの部屋で最も古い

BACK INTO ENGLISH

I was the oldest in this room.

INTO JAPANESE

この部屋で最古だった

BACK INTO ENGLISH

It was the oldest in this room.

INTO JAPANESE

この部屋の最も古いだった。

BACK INTO ENGLISH

One of the oldest of this room was.

INTO JAPANESE

最古のこの部屋であった。

BACK INTO ENGLISH

In this room the oldest.

INTO JAPANESE

この部屋で最も古い。

BACK INTO ENGLISH

The oldest in this room.

INTO JAPANESE

この部屋で最も古い。

BACK INTO ENGLISH

The oldest in this room.