I moved from the UK in my early 20s, prior to that I was young and stupid, so I neglected to vote there. Then I moved to America and started the green card process, and didn't feel it was right to vote for things back in the UK as it wasn't my home anymore and it wasn't my place to say what should happen there. I finally naturalized around a decade after I moved here, and immediately signed up to vote. I actually cried at the polling station because I was so happy to vote for the first time ever!