Are you just trolling? What don't you get? Here is an example. Let's say right now if I make it to 65, I retire at 5%. If the retirement age moves up to 67, to get to that same seniority level of 5% means I need to work longer than I planned (67 instead of 65). If I still retire at 65, that means instead of spending my last few years at 5%, I am at 10%. That means age 67 negatively affects everyone younger than those who are 65 right now. Either they work longer than planned to get to the same seniority, or they give up that seniority. Do you really not understand this? If so, I strongly question your cognitive abilities.