If I have the opportunity to be among the OGs that had opportunity to have bitcoin in the golden days of bitcoin, I will probably hold some and sell some of them. The reason for selling is to cater for my current financial level because I can't millions in bitcoin without selling some for myself. I will leave the rest to see how the future goes because selling all your bitcoin without having any in your care is like becoming slave to the tradition financial market.

The oldest people are still holding because they are rich already with some they sold back in the days and they are leaving very fine. Most of them like their privacy, so they don't show to the world ttey have this bitcoin to their private keys. Just imagine selling everything at todays price and then next year after the halving bitcoin rose to $100k, that's like 3 times the current price of bitcoin. So why sell your bitcoin when you don't even need the money right now? That's the common sense why I think they are still holding.