George Bernard Shaw, a playwright, novelist and socialist of Ireland, said “Youth is a wonderful thing. What a crime to waste it on children.” Youth is the power and energy that is the source of a child's behavior in childhood. Because you are young, you can do what you want to do and experience something you have never done before. But youth does not last forever. As you get older, the energy of youth decreases, and adults who grow up like that often say this. "I should have done this when I was young," or "I shouldn't have done that."
The days when we think we waste our youth the most are when we get married and raise our children. When you hear Shaw's famous saying at first glance, you can think of it as a pity that you wasted your youth while raising children as an adult. But in this age of demographic cliffs, raising children has become a great thing to contribute to society. Therefore, what Shaw means in the above citation has to be understood as referring to the inability to properly use the energy due to immaturity during adolescence and youth, wasting time and energy on silly and trivial things. How regrettable it is to waste the most important period of time given to you, doing nothing valuable and meaningful.
Youth is too beautiful to be spent sitting at a desk or watching smartphones or playing games all day long. People often regret what they have done or not done later. Therefore, it would be much better to do what you can, want to do, or have dreamed for long right now than wasting time and energy doing what you will regret later.