The data I’ve seen on grill consumers shows that they’re predominantly male and are in the 25-44 age group, with also a healthy share of those 45-64. Unsurprisingly, it also mirrors the demographics of the readers of this website.
Outside of grilling, two activities that are popular with similar demographics are NASCAR and the UFC. Both have fans that are passionate, predominately male, and are mostly 25 to 44 years of age.
