let me make it less cryptic.
Short version: Benefits should not be tied to age of retirement if the age of death is not the same across the board. If someone is expected to die sooner due to income, they ought to have access to benefits sooner.
Long version: Time. If life were fair, we'd all get the same allotment and enjoyment. Life isn't fair, you get cancer, timeline's cut short. We're a democracy, one person, one vote, "all men are created equal", equal protection under the law (lol), yada, yada, yada....by extension gov attempts to make people's time equitable. You see it in punishment under the law (in theory), compensation in judgments (to some degree as income comes in play).
You can't make time so we monetize it instead. You give me your time, I give you a salary. We often talk about "redistribution of wealth" but we never really discuss "redistribution of time". If I cut a group of people's schooling/education or healthcare or wages to move to private industry, it's not just money you cut, you cut that group's ability to make informed decisions on nutrition and health practices (annual checkups, sex ed, time in the gym you can't afford due to OT from cut wages) and ability to extend their time line. I said you can't make time but you can buy it. If I'm wealthier as a result of the aforementioned, I can buy myself some more years by affording an hr to go to the gym, healthier food, better schooling, better lawyers to get me less time incarcerated, better docs....etc.
So we don't just have income inequality but a lifetime disparity. Since we're unwilling to fix it, then it makes sense to make benefits weight adjusted by age to address it. Having the same cutoff for all when the average lifetime is not just means aggravating time inequality.
Gov. can address both quantity and quality of life....quality is subjective and paradoxically the poors have higher satisfaction (must be all those unhealthy habits making life worth living) but quantity, quantity is easy.
*puts roach down*