Question

what is second childishness? why is it called so?

Answer 1

Second Childishness is basically old age. Old people during the time they are old act like small children.
They tend to forget things and do not care much about what is going on. They don't have teeth and take a while to understand things. Thus, when a person grows old, he/she acts like a small child.

Answer 2

old age is called second childishness because in this age people begin to behave like a child