If I am not mistaken, there is no mandatory retirement age under Part 91K or Part 135, but for International Operations you're subject to ICAO rules which specify 65. So the playing field has not changed for the fractionals - the rules now are what they have been.
There is no mandatory retirement age for 91, 91K, or 135....but there SHOULD be. FAA missed a chance to say "okay, raise 121 to 65 but that will also be the cut-off for ALL 91K and 135 flying." And the ICAO limit doesn't mean much. We send guys all over the planet that are WELL over 65. Just have to make sure the other guy ISN'T.
The status quo has not been disrupted, unlike the Part 121 carriers, where everyone under the age of 55 essentially suffered a five year period of career stagnation, or worse - disruption - as a result of the rule change. What's worse, it came about in the worst recessionary period in the history of our nation, rivaling the Great Depression in terms of destruction of wealth. I'd love to be able to grab some 14 year guy's seat at a nice fractional and have an easy life - but I'm not entitled to, just as much as I'd like to be a 777 Captain at a legacy, but the system won't support that fantasy now, or ever, as the seniority system in the U.S. was broken the day it was instituted by the uneducated and misguided "founders" of ALPA.
If you think fractional flying is "the easy life" you clearly have never done it. An airline pilot walks around the jet, looks at the paperwork, boards the jet, turns left, closes the door and flies. We pre-flight the jet, cater it, supervise servicing, load the bags and people into it, then fly the jet (frequently into an airport we've never even heard of with dubious weather reporting and marginal runway lengths), fly three or four more legs of the same ilk, clean it, lock it up, and then try and find a ride to a no-tel, mo-tel in east god-knows-where so we can do it all again ten hours later. And all for about 60% of what a garden variety legacy airline pilot gets paid.
So the guy that's in his 60's and is flying a nice CL601, well, he's entitled to be there. And by the way, I was vehemently against raising the mandatory retirement age, but it just doesn't apply here.