Senators love to suggest raising the Social Security retirement age, when in fact, Social Security is fairly stable financially and with a little tweaking, will be fine, providing a steady, foundational income for every American, many of whom will have very little other retirement income. You can be pretty sure those Senators and their loved ones are millionaires, and/or have sedentary jobs that they expect to work at until the good Lord takes them home, so any cuts in Social Security definitely won't affect them!
The real problem in the entitlements area is health care, including Medicare. (An even bigger problem is a bloated war budget, but I won't get into that here.) That's where the big deficits are expected, because health care demand is increasing at rates far above the rise in GDP. So why don't Senators suggest cuts there? Two reasons. One, they're politically chicken. And two, lots of wonderful special interests group in the health care field (hospitals, doctors, lawyers, big pharma, medical equipment, etc.) directly benefit from that spending, so it's simply much harder to cut.
Frankly, with our current political paralysis, I don't see anything good happening along those lines until the big crisis hits, ie. foreigners refuse to buy our debt and the currency crumbles. Then, all kinds of bad things are going to happen.