Which is more profitable, teaching retired middle-aged and elderly people to learn electronic organ and piano or teaching primary school students hard pen calligraphy?

Teach retired middle-aged and elderly people to learn electronic organ or piano. Teaching retired middle-aged and elderly people to learn electronic piano or piano is more marketable, because with the improvement of people's cultural and entertainment level, more and more people begin to attach importance to music education, especially in family education, learning piano or electronic piano has become the choice of many families.