My observation of people IRL is that that is a prime truth. A family friend has a six year old that surprised the hell out of us at dinner one night. She insisted that she order the food for us at the local Chinese restaurant. So we humored her. She proceeded to order the meal in Mandarin. Her mother was as shocked as the rest of us. The kid had learned it during their two hour per day commute off of an ipad. She told me over Thanksgiving that she is working on Spanish. I have known adults that can’t even order the basics in Spanish, let alone Mandarin.
Young minds are very fertile ground for learning languages. If they don’t keep up with it, though, they lose it. I have friends who were bilingual as young kids, growing up in mixed-culture households; but they lost it.
I know a word in Spanish: Chulapa. :)