The oldest coin I've been holding is Bitcoin alone and newer ones are memecoins. I am still hopeful to reach my target to get a whole Bitcoin though I don't have timeframe to really have it but as soon as I have it I'll post it here. It's not that easy to have that challenge knowing that I don't have enough money or weekly Bitcoin income to fill it in but yeah it is the only oldest coin I have for now.
BTC and ETH are special exceptions due to their advantages that no new token can have. BTC is the first crypto, still using POW, has the most decentralized and secure network on the market. ETH is the first ALTS to use smart contracts and lead the development of blockchain technology. I think they always deserve to be in the portfolio, account for a large part of the investment capital and ensure that investors will have profits in the bullrun. We don't need to compare them to new coins because they have their own value and position in crypto market.
Yeah, both are prime movers in crypto market, we have ETH to be the king of altcoin market and everything that was created after was somewhat in the mold of what ETH is right now although it went into several stages and now at PoS.
As compare to Bitcoin who still remain at PoW and it will remain like that. Although there are a lot of challenges, at the end we will see new all time high in this bull run.
So don't forget about this two, or what others have here, majority are into Bitcoin and their portfolio 60% of it or even more.