Not trying to start a demographic battle but I’ve never hear a 30YO pushing for 67. It absolutely is being supported by older guys.

Having said that, there’s no magic number- 60, 65, 67, or 89- that’s going to apply to all individuals equally. If there’s one where average decline is most pronounced, I’m sure I don’t know what it is. What I do know is 67 will do about as much to solve the pilot crisis as 65 did. What is it they say about trying the same methods & expecting different outcomes?