Use "puerility" in a sentence

1. It puzzled him that thinking of an eighteen year old girl made him feel embarrassed about the puerility of his actions

2. However much I might detect in Zuchin’s character and amusements an element of coarseness and profligacy, I could also detect the fact that his drinking-bouts were of a very different order to the puerility with burnt rum and champagne in which I had participated at Baron Z