One thing I like about older coins is they tend to be more established. If they've been around for a while they likely have some publicity, money and reputation. That being said, when going for older coins I prefer blockchain coins over some of the types you listed. Tron and Stellar are two coins that have been around for a while and although they haven't shot up to $20 or $30, they've been stable and have gone up in value. Those are 2 coins I consider to be old and still like because they've been around for a while and have proven themselves to be fairly stable coins. If they could do something big on their blockchains then I feel those two old coins could still have a ways to go profit-wise..