"Finnish is an old language."
Translation:Suomi on vanha kieli.
In the same manner that all languages are old, sure. It has its roots in Siberia several thousands of years ago. But modern Finnish was constructed in the 1800s from local dialects, when there was a need for a strong independent Finland, in order to keep the newly established Finnish Duchy free from too much Russian influence.
It would be difficult to convince the Russian tzar why your independence was important, if you insisted on speaking Swedish even after you were "liberated" after all.