Often K-Pop age statistics are based on sold concert tickets. Here's a statistic for Blackpink.
But this statistics are only half of the truth. Perhaps older K-Pop often don't have the time to go to concerts anymore, because of their family, time-consuming jobs or hobbies. Or their ult groups don't give any concerts in their area, and they don't want to spend too much money for longer travels to a concert. If you are the only person in a clique who listens to K-Pop, you maybe don't want to go to a concert alone.
I prefer watching MVs and buying albums too. One day I want to visit a Dreamcatcher concert. Once. That was about it. But ... I didn't visit any Heavy Metal concerts for the last 8 years too. I have about 500 Metal albums, but regarding recently bought concert tickets I wouldn't be a Metal fan.
There are some prejudices against K-Pop in Western countries. Some time ago the Metal scene had similar problems: All Black Metal fans are statanists and burn down churches. All Metal musicians are alcoholics or drug-addicted.
Tattoos: People with tattoos came out of prison.
Oh, and violent video games ... people playing First-Person Shooters are potential spree killers.
It's the same with all subcultures - there are many people that don't understand them. And because they don't understand them, something must be wrong there. Here in Germany video games are part of the mainstream now - no politician talk about 'Killer Games' anymore. The Metal scene is part of the mainstream too - no one talks about Metal fans being Satanists anymore.
When K-Pop got more popular in the West, prejudices like "it's music for teenagers only" or "all K-Pop idols are slaves of their CEOs" will be gone too. In the meantime ... just ignore this claptrap.