Zcoin is also middle-aged - the coin has existed since 2016, based on the Zerocoin privacy protocol.
You need 1000 XZC to start, masternodes on the network - or Znodes - receive 30 percent of the block reward. 56 percent goes to miners, and the remaining 14 goes to developers.
Due to its age, Zcoin is traded on a huge number of exchanges, so it won't be difficult to exchange rewards.