Final answer:
Gage's storytelling ability suggests he is in the first grade or higher, demonstrating the language development typical of children in middle childhood, which ranges from 6 to 10 years.
Step-by-step explanation:
Gage's ability to recount a story to his mother indicates that he is likely developing narrative skills consistent with children in middle childhood, a stage that spans from ages 6 to 10 years. During this time, children typically have a vocabulary that allows them to form complex sentences and understand humor in jokes and riddles.
These linguistic skills imply that Gage could be in at least the first grade, where formal schooling has begun, and he is acquiring a more advanced ability to communicate experiences in a structured manner. Depending on Gage's exact narrative capabilities, such as the complexity of his storytelling and his command over vocabulary, he could be in a higher grade within the middle childhood bracket, potentially anywhere from first to third grade.