When children were young, they always asked:
"Mummy, why like this?" or
"Daddy, why like that?".....
Laogong would always answered them like this...
"Boy/Girls, I'll tell you when you are 18 years old."

We met up last Sunday for dinner. Laogong asked...
"so Ken, now you are 18 years old, do you have anything to ask?"
Kenneth smiled.