I noticed that not ONE of you advocating for an increase to 70 has responded to the G-3 debacle lambourne posted.
That is because, it was not a 14CFR121 flight, nor a 14CFR135 flight, but...a ferry flight conducted under 14CFR91 (by a 14CFR135 operator).
No bearing whatsoever to the discussion, here, regarding scheduled airline transport ops.
I expect you fail to notice the difference, poina....no surprise.
And, just for your very limited knowledge, poina, 14CFR135 and 14CFR91 ops are conducted on a regular basis, by Captains seventy years of age, or older, in Gulfstream aircraft.
Just last week I met one, 73 he is, and still sharp as a tack.
The co-pilot seemed sharp as well, about age 35, or so.
I would suggest that you do not comment on what you don't know about, personally.