How old is the narrator when he is first infected with "puppy love?"

The narrator was 10 when he is first infected with "puppy love".

Explanation:

Chapter Two begins with the narrator, Billy, at the age of 10 when he is first ‘infected’ with puppy love. He wants two dogs and they have to be a special kind and a special breed. He wants coon hounds but his father says they cannot afford them right now and his mother agrees.

the flighty purpose never is o'ertook / unless the deed go with it"