The great news is that you have infinite power to change and refine your brain. A few decades back, scientists
thought that people could have very little influence over their brains. It was assumed that by the time people reached adulthood their brain connections were permanently and indelibly in place.

 In childhood, one might be able to exert some influence over the development of the brain, but for the most part these things were genetically determined. It was thought that the old adage “You can’t teach an old dog new tricks” was literally true.
More recently, scientists have discovered that the opposite is true. There is a quality to the brain called neuroplasticity that allows you, right up to the end of your life, to restructure and adapt your brain according to your needs. You
can learn new things and adapt to new environments, even in extreme old age

from’ Brain management’ by ilchi lee