This question is about "Peter Pan". Although the narrative of this story focuses on the desire to maintain childhood feelings, the work shows a strong contrast between adults and children, which highlights the reasons that lead Peter Pan to not want to grow old.
In history we can see that children are bold, adventurous, courageous and even somewhat selfish, since they care only about themselves and what makes them happy.
Adults, on the other hand, are represented by Wendy's parents (Mr and Mrs Darling) are restrained and show strong selflessness. That's because they give up their own interests to give their children the best they can offer. This is shown in different ways because Mr. Darling shows this selflessness in a tougher way, but we can see the concern and sacrifice he makes for his children, while Mrs. Darling shows it more gently, but also notably. This selflessness causes adults to be concerned, busy and calculating, because they have concerns beyond themselves.