If it’s hit or miss, what’s the chances that it’s pure coincidence that someone gets an AA interview after showing a CJO from elsewhere? This seems more likely to me than the “I got an interview at AA because Delta/United gave me a CJO”.
Age 67, 68, it doesn't matter. Guys/gals should retire/med out at 65 for solidarity to show the company/the industry that the can can't be kicked any longer. Small anecdote; the last 4 CAs I flew with were all within 3 yrs of retiring and they all said even if it goes to 67, they're done at 65.