Our son is almost five, and absolutely loves superheroes. When I make up stories to tell him, he's not that interested... until I mention that the protagonists have superpowers, in which case he's riveted!
Our daughter is almost three, and wants to be exactly like her brother... so she's obsessed with superheroes too. I was surprised the other day when she could identify all the members of the Justice League! Guess having a big brother rubs off on you...
Is your LO obsessed with superheroes?