It's impressive to see such an old coin like Dogecoin still alive and actively traded on the market these days. After all, developers have abandoned the popular meme cryptocurrency altogether. I guess that what is keeping the DOGE alive is its community more than anything else. Because of DOGE's inexpensiveness, anyone can use it for micropayments and other sorts of things. You can "hodl" Dogecoin for the short term, to do quick transactions between peers. However, it's not recommended to use it as a serious investment for the long term because of its inflationary model. The supply of Dogecoin is enourmous which tends to debase the cryptocurrency itself.

Litecoin on the other hand, is a much better option than Dogecoin. It's one of the most rare cryptocurrencies in supply, next to Bitcoin. With only 84 million coins that will ever be mined, Litecoin is often compared as "silver" to Bitcoin's "gold". The main concern about old coins is that they could be abandoned anytime for the next big thing in the crypto space. I've seen many old coins out there that are not being traded on crypto exchanges anymore. They still have a healthy Blockchain network, but there's no one buying or selling them. This could happen to Dogecoin or any other old coin if interest is lost from people in the mainstream world.

Nonetheless, I'm still holding a few old coins because they're unique than some newcomers in the crypto space. For instance, Namecoin has a decentralized domain name system, while Primecoin has a unique PoW algorithm based on prime numbers. Even if they stop trading on the market, people interested in these coins can revive them or perform trades OTC. What matters is how useful a cryptocurrency is for daily life, instead of its price. Let's hope that old coins remain on the scene for a very long time. Just my thoughts