I don't think there's anyone holding from 2010 who hasn't sold to date. I think that every human being must have lust and fear, and when someone feels they have made a lot of profit, they will definitely sell what they have and are afraid that the price will return to a small number. but in my opinion, someone starting in 2010 has been familiar with bitcoin and trading up to this point, I'm sure there is.
I know a couple of guys who got their first coins in 2011. Right now, they have less coins when compared to me. It is hard to avoid the temptation to sell at least some of your coins, when the correction phases happen very frequently. There is always a fear of Bitcoin plateauing and then gradually going down. This was the case especially in 2015 and 2018, when the exchange rates plummeted by 80%-85%. It is hard even for very experienced users to refrain from panic selling, especially when they hear such rumors.