Cowboy movies and folklore were huge with boomer generation as kids. I suspect that a lot of cowboy action shooting was fueled by the boomer generation and as they get older and compete less it’s causing a decline.
Unfortunately most 30 year olds for instance if they shoot at all are going to gravitate towards different shooting disciplines such as long range precision shooting or something tactical.
When I was shooting, at least 50% were families. Husband,wives in the 30-40 yr old bracket and teenagers. I'd say less than 25% were boomers