It took 50 years to learn basic skills. And then I started real Kendo training because I tried to do Kendo with my mind.
People start losing good ability of legs, when they turn 60. I started to train to use my mind correctly to support physical disadvantages.
When I turned 70, I started losing strength in other parts of my body too. Then, I trained to control my mind to stay calm.
At 80, I know how to control my mind. But still I "think" sometimes. Now I am training myself not to think."