Well you can't know people who held their bitcoin for that long or maybe they just forgot that they have bitcoin in their wallet  open it, i started bitcoin when i was high school i think it was 2013 and it was my really good investment where i supported my self to graduate in high school until i graduated college i also have small business now that came from bitcoin this is reason why i keep solding half of my bitcoin and if i keep that bitcoin for that long maybe i am not who i am today.