I think old coin takes time to get be profitable in the market but it's depend on the project and the team who handle it. It will happen to the project if the developer will scam thier investor and gone like a bubbles. In this crypto world I learned how powerful the "be patience" in every project.
I think the old Coins are extraordinary, we now hold a new coin to make it old and sell when it will fully develop and the price rises high.
It depends on development, I believe that the old Coins are the most potential Coins we need to invest. This is all because some old Coins are fully developed and many people around like now hold old Coins and wait for enemies when it's best to sell and produce.