The only reason that an extension beyond the age of 55 years is being contemplated and orchastrated is purely for the benefit of airlines that are short of crew.
Of course it will delay Command for every F/O. That is pure and simple commonsense and arithmetic for Grade 1.
Is is not being done for your benefit! It is actually beneficial to airlines that pay a retirement wage (pension) for you to work as long as legally possible and then for you to die as quickly as possible after retirement!
If you have not planned your escape by the age of 55, then you are statistically doomed to die on the job or shortly thereafter. If in doubt, please re-read
jtr's link above (copied below):
http://faculty.kfupm.edu.sa/coe/gutu...sc/retire1.htm