The only adult people who watch those movies, are parents with their kids. Never saw any single adult persons in theatres.
Your wrong, i've seen alot of single adults seeing the MCU films and enjoying them.
"Unicorn, mermaid, sorceress, vampire, gargoyle, werewolf, elf...no name you could give her would surprise or frighten me, i love whom i love"-Prince Lir in The Last Unicorn (book and movie).
