No the reality is many big budget films are targeted towards AS MANY PEOPLE AS possible. It doesn't make business sense to target one demographic. Business people target qualities that hit as many demographics as possible.
In short you could say that the mainstream general audience is what the big budget move is target-ted towards.
Something like the MCU which is over a decade old doesn't fit your thinking. If the first movie IRON MAN, which "targetted teens" is a decade old then most of those teens who watched END GAME that another movie that targeted the people who watched the first iron man are no longer teens. They aged out. If iron man targetted teens then end game didn't. So most likely all these super hero blockbusters are just targeting all demographics. Don't be so shallow in thinking that only teens are "dumb" enough to like super hero movies. Plenty of other demographics and "smart" people appreciate blockbuster entertainment.
End game had clear nostalgia references to people who watched the first iron man and his death only had emotional meaning to those who followed him for over a decade. Younger people in fact tend to think of the MCU as stupid, because iron man came out when they were too young to be interested. I've found people in their early 20s have this attitude and I'm guessing that's you. To me someone in their 20s is practically a teen.
Older people appreciate the MCU because their memory stretches back further. They don't see the MCU as a decade of cookie cutter copies because that decade only takes up a tiny fraction of their own cinematic life time. They see that everything that came before the MCU was different and the MCU is unique. Meanwhile young people who've seen the MCU all their lives see it as stupid because that's all they've seen their entire short lives.