I'll peg the odds of this guy finishing all 3 in a year at 1 in a 10,000. At 71, you don't train as you go at 10 mpd and then ramp it up to 30 mpd on the northern sections of the pct/cdt. Doing the AT alone will be a grueling finish in the north for him
That being said, I hope he has a damn good time trying!