Problem is most young people don't vote in large numbers. I do and I'm 28 but not many. Old folks seem to vote in larger numbers, so if they think SS reform is gonna hurt them they're going to vote against anyone who votes for it. The politicians know this to be true. If young people are more vocal and vote more often this would pass without question IMO.
That's because 20-30 somethings are busy making the American economy hum while the 60+ bluehairs just take a break from playing bingo and get shipped by the busload to the voting booths.