It wasn't 12k in a decade ago. It was 12 USD. Probably a typo or you read it wrong. But yeah, those you held for a decade (I wonder how many of them are there), invested a good amount is probably leading the life now. But I doubt we will be seeing the price go up the similar way in the next few years or in a decade.
Most of the guys that hold since that era are typically those who forgot there Bitcoin wallet already and just recovered it lately. At that time Bitcoin price is too volatile and there’s no guarantee that the market keeps moving upward since there’s only few exchange and one of them is MtGox that start the bad impression of CEX for not safe to hold funds. I’m sure at that time is very anxious on holding there tokens due to a lot of scams so typically only few will remain as OG holders and those people are the one who didn’t check there wallet most of the time as well as the price.
A lot of people are exaggerating that if they had a chance to go back to that time, they would buy and hold to this day, or who wish bitcoin would drop to $1k and they would spend all their wealth to buy bitcoins. It's all a lie, I believe if we were at that point and things were uncertain we would be just as nervous as they were and quickly sell bitcoins if there was a profit. No one is brave enough to trust and hold bitcoin until now, no one is brave enough to hold bitcoin when our wealth grows 1000 times.