How old is Enzo the summer Denny's drives with Luca pantoni?

Enzo is 17 years old during the summer when Denny drives with Luca Pantoni in "The Art of Racing in the Rain." This summer is significant because it marks a pivotal time in the relationship between Denny and his daughter, Luca. Enzo, as the family's dog, provides insights and reflections on the events unfolding during this period.