People won't give you a break just because you come from Japan. You can't say Japan has its customs when it comes to music. It's wrong to say so in music, anyway. People have to rid themselves of this kind of thinking as soon as possible. We are in an era where people who listen to a Japanese orchestra will listen to a Vienna orchestra the next day.
Musicians can never stop studying.
You are 63 now. When you get older, you have more experience, which can help you. When I was young, I used to get up early and worked from 4 a.m. to 9 a.m. without taking a break. Now I have to take a short break every 20 minutes. My concentration is not as good as before.