Most of my interests have dramatically changed over the years.. but some have just evolved.
ie w/ reading, I've read a lot, then not so much, then read a lot of texts for school, then not so much.. then read a lot again - but completely different subject matter due to different interests more recently, but it's still reading.
Several other interests have been sorta life long, too. Nature, outdoors, sports, math/business/economics/learning etc.
But this thread reminded me of one that's evolved in the most awesome way: Kites. I remember winning 2nd place in a kite making/flying contest at school when I was 6 years old in grade one. I had a few kites here and there over the years as a kid, but wasn't suuuuper into them - but I did always like them & enjoyed them. Had a simple one w/ 1000ft of line that I'd fly as high as it would go, and then a small 2 line stunt kite that wasn't quite big enough for the low wind speeds here. Then several years ago I got into power kiting & kiteboarding, and have been snowkiting, kiteboarding on land, kiteboarding/kitesurfing on the ocean.. I currently have 3 kites for land based kite sports (and need bigger ones if I'm going to do much on land) as well as 3 surf kites & all the rest of the gear. I haven't been out on the water for a few years now, and oh do I ever miss it! I'm still a relative newbie on the water, but for several reasons I know I'll be able to nail it when I get back out again - which should be this Summer!
Kiteboarding is, to me, the absolute ultimate sport & sensation. *feeling tinglies* 
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for supporting trump. Because doing so is deplorable.