Scientific research shows that children's potential cultivation follows a peculiar law—the law of diminishing talents, that is, children's talents decrease with age, and the later the education starts, the less the born gift can be played. Everyone has a certain type of born gift, the best time period of developing it is the first few years since birth. Therefore, early education is one of the necessary ways to develop children's potential.
The well-known Montessori addressed in her book that the most important phase of education is not in the college, but in the first few years since birth. It said, assume a baby is born with 100 gift, if the baby starts training since 5 years old, he/she may have the chance to achieve 80, if the kid starts training since 10 years old, he/she may have the chance to achieve 60.
Many believe that capability increases as people grows up, it's actually wrong.
An easy example is piano playing. If a kid doesn't start piano training since age 5, he can't make a great player no matter how talented he is. Have you seen any great player who starts the training since 10 years old?
This is my opinion, it's the point that I got from an article I read about in the past.