I apparently don't have a solid grasp on what "age appropriate" looks like: my special interest throughout all of middle and high school was Snoopy, and I made no effort to hide it, because I didn't think there was anything strange about it, and wasn't aware that there might be until reading the article. My current interests are more nerdy and "gender inappropriate" (X-Men comics and dinosaurs) but that's different from being age inappropriate.
I liked the beginning of the article where the author described how Mickey just started talking to the stuffed animals in the store; that sounds exactly like what I do, wording and all. I obviously check first to make sure there's no one around to hear me and think I'm mentally deranged, but I absolutely talk to stuffed animals, my own especially.
I also have a hooded cape that I made, and I'll sometimes run around the house as the crime-fighting super hero, "Aspie Avenger" with my imaginary friend Bob as my sidekick "NT". I don't do it in front of my family, but they will often see me running up and down the stairs in my cape after my imaginary villain (and people say autistics have no sense of imagination!)
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"Survival is insufficient" - Seven of Nine
Diagnosed with ASD level 1 on the 10th of April, 2014
Rediagnosed with ASD level 2 on the 4th of May, 2019
Thanks to Olympiadis for my fantastic avatar!