Hmm, mine is old :) 4 years and burning hot with every game I play. So I’m used to it!
MacBook Pro (Retina, middle 2012)
2,6 GHz Intel Core i7
16 GB 1600 MHz DDR3
NVIDIA GeForce GT 650M 1024 MB
The fact that it has 1gb of Nvidia Geforce graphics might give it a bit of an edge here in comparison to the machines I've tried on. Still might not be enough. Between Unreal's poor mac optimisation and my poor Unreal optimisation, it might simply fail to load. Still, shoot me an email at firstname.lastname@example.org if you'd like a link to my crude Mac build.