Minecraft on an iMac Core 2 Duo 2.4 GHz 20-inch (Al)

Just in case anyone out there on the Internet would like to know, the current version of Minecraft runs quite happily (according to Mr 7 y.o.) on an iMac Core 2 Duo 2.4GHz 20-inch (Al).  The iMac has 4GB of RAM and is running Mac OS X 10.11 "El Capitan".