I found out about it in probably 2016.  Didn't buy until 2017 though.  I mostly held, but traded a lot in 2018 which didn't end too well for me. But luckily Ive always held and ever since around 2018, I've really gotten into the aspect of bitcoin that there's no intermediary.  No banks.  Peer to peer cash transfer, it's really quite remarkable.  I'm old now, and as I've learned over the years, I can say with confidence that it's the fastest growing technology I've ever seen.  Truly incredible what bitcoin is, and what it can become.  I hope it lifts up those in 3rd world countries that don't have access to banks, and I truly believe it is power for the people. It will change everything.