With all of the hype surrounding "De-Fi" and NFTs, it looks like old coins like Peercoin, Primecoin, and Quark have been left in the dust. This is sad, considering that the aforementioned coins have a proven track record of stability and reliability. New coins are usually less secure than old ones. Despite the low interest/demand for old coins, they're still actively traded on the market.
I'm wondering whenever it's worth buying and holding old coins for the long term. Primecoin is one of its kind with a PoW algorithm that contributes towards the discovery of prime numbers. It's a pity other crypto projects haven't copied its model. Your input will be greatly appreciated. Thank you.

sometimes it is not unreasonable to hold old Alcoins like that, there are some old altcoins that are worth keeping and some should be released considering the growing popularity today. like the Altcoin you mean "Primecoin", I don't think that altcoin has a great popularity when compared to other altcoins. so for now it looks like old altcoins that are worth keeping or buying are like Dogecoin, and Btt.