YOU SAID:

We've ko=nown each other since we were like ten

INTO JAPANESE

私たちは10歳の頃からお互いにko = nownしました

BACK INTO ENGLISH

We have ko = nown each other since we were 10 years old

INTO JAPANESE

私たちは10歳の時からko =お互いに今を持っています

BACK INTO ENGLISH

We have ko = each other now since we were 10 years old

INTO JAPANESE

私たちは10歳の時からko =お互いになりました

BACK INTO ENGLISH

We have been ko = each other since we were 10 years old

INTO JAPANESE

私たちは10歳の時からko =お互いでした

BACK INTO ENGLISH

We have been ko = each other since we were 10 years old