 Brain can be changed and it can change yourself. You can read a book called The Brain That Changes Itself. So it's scientifically proven. No matter how old you are, you can be 80 years old. Your brain is plastic and it can change and it can be rewired. How plastic your brain is determines and how fast it can be rewired, right? Just imagine you have dough and if it's soft dough, you can shape it and reshape it easily, right? But if the dough is starting to harden, it's harder to shape. So for some of us, we have very plastic energies. Some of other groups of us have very non-plastic energies, so it just takes longer to mold.