2018, I think. I heard news about Bitcoin as it's used for illegal activities like terrorism, money laundering etc. So I searched and learned about it on YouTube and Google, then I found more and l'am curious too. Then one of my friends recommended this bitcoin talk platform.
Mine would be around 2016 with the same reason, I was curious about Silk Road first and then the people covering the topic keep mentioning bitcoin so I got curious and that's when I started reading about bitcoin although my fascination at that time was the enigmatic creator so I don't dived too deep in technicals, I was an 7th or 8th student at that time so all I care much about back then is playing games with my friends.