I'm not kidding when I say this, when I was 3 to when I was 9, I had an interest in cars for some reason, although obviously I couldn't drive or anything. As the summer between my 3rd and 4th grade years in 2009 wrapped up, the interest faded away, but when I was 14 it came back, although it's not as great as was in the past.
Also, when I was 12, I started getting into working out, which was the complete opposite of how I was before 2012.
The main interest I've had that has stuck with me over several years has been video games, which I've been playing them on a regular basis since 2008, although I had begun getting interested in them as early as 2006. However, since roughly 2014 or so I haven't been playing video games as much.
My taste in music has also changed. Honestly, until 2010, I didn't really listen to music at all, although in the summer of 2010 I had gotten into techno. I then got into Jpop around the end of 2011 and was into that for a while. I didn't like Kpop at first when Gangnam Style became popular in 2012, but by 2014 I had gotten into 2NE1, sadly just two months before their hiatus, which is why I was extremely disappointed when they disbanded this past November.
I also started getting into rock music at the end of 2015, and I listen to that a lot too now.