"The old language is still one of our common links."

It was the only greeting I knew in the old language.

He had learned that sept meant seven in some old language.

He shouted something into the sky in some old language.

"Their children want only to be American and not learn the old languages that were good enough for us."

Why, you even speak the mother tongue, the old language.

I believe that means the mother in the old language.

"I'd like to learn some more of the old language, too."

More likely the name was handed down over the centuries, like the old language.

The other three looked at her as though she had spoken in an old and now unknown language.