When I went to my MIL's office, she was talking to the daughter of one of the tenants.
This 7 year old girl can speak fluent fookien and even mandarin.
Wow! I'm impressed ( and honestly, I was quite envious) that she could converse with my MIL with such command of the language.
Oh, she's from China but still, it's amazing!
I feel the same way when I hear kids in Paris speaking fluent French.