The United Nations’ world health organization has made new rules on age:

Young persons under 44 years of age;

Middle aged between 45 and 59.

Young senior aged 60 to 74;

Aged 75 to 89 are elderly;

People over 90 years old are long-lived.

I spent the first year of my middle age carefully. This year I bought an electric piano, so from now on I can wear headphones to practice; This year, I bou…