I think old coins are profitable but not much popular. If we don't talk about old coins like BTC or ETH then there is NEO or other ~1 year old coins that are still being used.
The fact is that ethereal will remain One of the most promising coins in the cryptocurrency market and, at the same time, there can be no objections. With Bitcoin, there is already a lot of excitement and anxiety. But you really need to pay attention to other projects, such as waves, Stellar, NEO and EOS.