I have the oldest coin, Bitcoin, where I use Bitcoin as my safe point for shopping on cryptocurrency exchanges. It is my main currency in the digital world.
Then there is the fifth oldest coin, namely DOGE. The low price makes me really like using DOGE and having it for bill payments, cellphone credit, hosting services and VPS through local resellers.
Here is information about when the oldest coin was released,
click hereBitcoin is the oldest and most reliable cryptocurrency in existence today. This is an oddity considering that most old coins tend to become abandoned and de-listed from exchanges over time. That's why Bitcoin is a good-old coin worth holding for a very long time. Ethereum is also worth considering, since it has an established presence on the crypto/Blockchain industry. The large number of developers working to make Ethereum a better smart contract platform for all, shows us that it'll stand the test of time. By all means, your holdings on both Bitcoin and Ethereum will be able to last a lifetime.
Dogecoin is another option as well. Most people use it for micropayments and daily trading. I don't think there are other uses for the meme cryptocurrency. After all, it was abandoned by developers for quite some time. Dogecoin is becoming obsolete as other cryptocurrencies stay in the lead. I still hold many DOGE earned from faucets, but I don't expect it to be a long term investment because of the reasons stated earlier. On top of that, DOGE has a huge supply of coins which could have a negative impact over its price on the market. It's great as a short term investment than anything else.
Nonetheless, old coins will eventually pass by as new coins take the lead (except in the case of Bitcoin and Ethereum). It's best to put most of your investment into new coins, while putting a small fraction into old coins in order to reduce risks as much as possible. Otherwise, you'll be left holding a bunch of worthless coins that cannot be traded on the free market. Their underlying blockchain networks may still be healthy, but without a market, no one will support them. At least, old coins' source code can be put to good use by launching a brand new cryptocurrency that's able to build upon the original project's legacy. That's thanks to the decentralized and open source nature of crypto. Just my opinion