Yes!! ! I definitely had incredibly intense interests---and as an adult I still do.
Roller Coasters---by the time I was in high school I knew the statistics for every roller coaster in the United States---designer, builder, height, length, ride time, etc. Today, as an adult, I collect vintage roller coaster blueprints. I also am working on HO scale model roller coasters. When I was in grade school, I used to draw amusement park plans on my homework.
Music---this is my talent. By the time I graduated from college, I had collected over 30 synthesizers. Today, I have around 20 electronic keyboards, 4 organs, 2 pianos, 20 dulcimers, a bunch of harmonicas, etc.
Tents---I loved tents as a child. I had gotten around a half dozen I would say by the time I was in junior high school. I liked to set them up in the yard. Once, I set some of them up in a straight line across the backyard and took great pleasure by just simply staring at them.
And I had other obsession too--caves, magic tricks (have around 100 illusions---collected as an adult), etc.
Check out my profile for my intense narrow interests.