If you still had any question whether the AARP was an advocate for seniors or just a corporate insurance company front, that should have been resolved today when their CEO (for policy) came out with a new position for seniors. (bend over and spread 'em) They are willing to consider changes to Social Security for future retirees.
Any further increase in retirement age for people who do physical work for a living means either they work until they die or they live without social security for years hoping to survive long enough to collect on the "entitlement" that they have paid for. That 3 trillion dollars (that will grow to 4.3 trillion by the time all us boomers retire) in the Social Security Trust Fund belongs to Wall Street and not to retirees and don't you forget it.
A reduction in benefits is also simply theft of the Trust Fund. There are two reasons that the Trust Fund will eventually run out of money. The cut off for contributions is set too low and most of the income of the rich now comes in capital gains and the like that aren't taxed at all. The second reason is the corporate fascists have suppressed wages, one estimate I've seen is that without Reagan and his disciples the average middle class income would be 20,000 a year higher.
Reagan built a steady decline into the benefits based on a rigged CPI so that current retirement benefits are 40% lower than in 1980. To be fair, the Republicans have said for the last thirty years that you couldn't expect to retire on Social Security so they created the 401(k) and did away with those pesky pension plans as well. If you've checked your statement lately you will find your 401(k) is now a 301(k) and after the next crash it will be a 000(k).