I agree with this. Although what I find difficult is knowing what it is that is missing from the brain for late starters!
i mentioned this in my reply. the neural connections are still forming.
ie, excertp from a disc on 'language' we can substitute 'music' for a language, and a lot of the motor connections are also implied
"...When used, brain cells connect
Brain cells are not much good if they are not connected with each other. After birth, brain cells are making connections all the time. These connections are called synapses (SIN app sez). Connections are made when a child has experiences. Experiences make children think. When a child thinks, brain cells are used. The connections (synapses) get stronger the more the child uses them. These connections become a basis for how the child thinks.
...
The stories of two chidren can explain the idea of the brain making connections. Isaac is 2 ½ years old. He now lives in the United States and speaks English. But he was born in Mongolia. For the first six months of his life he only heard Mongolian. Since he was adopted by a family in the United States, he has heard only English. The brain cells that are used for understanding and speaking English are used whenever he hears, speaks, or thinks in English. Like anyone else, when Isaac was first learning English, he had to hear basic words over and over to help build the connections in his brain. Now that he has some very strong “English-speaking” and “English-understanding” connections, he doesn’t struggle to speak English. He can do it without effort, because the connections are strong.
Giulia, on the other hand, lives in Italy. She is 16 years old and was born in Italy. She has an Italian father and Korean mother. When she was young, she did not hear or speak English. Her brain could have developed “English-speaking” connections, but it did not, because she was not in an English-speaking environment. Instead, her brain made “Italian-speaking” connections. The same process of connections is used for everything a child learns. That is why experiences are so important...."