Huh. I have a late 2009 MacBook that runs 10.10.x just fine. I routinely run Apple hardware for 5 years - 3 on AppleCare and two on Novenas. So machine age per se is not a deal breaker. My AppleTV Gen2 that runs everything else that a Gen3 does, only at 720 and without BT AirPlay. Nothing of either of those spec differences seems to lock out YouTube. Not sure why having older models means native YouTube is unimportant.
4/20/15 at 5:58pm