The difference between
An immature child
Versus
An immature adult
Is that one has an excuse
And the other does not
And when confronted
With doubts to their maturity
Children will not deny it
Whereas adults will vehemently
Oppose such notion
Inasmuch as adults so often
Act so much like children there
Really is nothing that differentiates
Adults from children
In terms of maturity
Other than mere old age