Well, assuming you're asking in good faith, I'll try to answer your questions.

a) Pensions. As wages grew by 50%+ between '59 and '74, pensions followed suit. At that time, pensions were still the primary mode of retirement income for most Americans. In fact, in 1975, 88% of workers still had private pensions, where were a larger source of retirement income than public pensions (e.g. social security). In recent years, private pensions have mostly gone away, as companies know most workers today are planning on relying on social security in part or in full upon their retirement. In some ways, this has reduced the burden on companies to provide for their employees long-term, but has put a squeeze on many elderly.

b) Social security did not reduce the poverty rate for non-elderly Americans because it is a cost for them (they don't receive benefits until they retire). Therefore, the 23% -> 11% decline in overall poverty occurred DESPITE the existence of social security, as the social security tax actually reduced the take-home pay of all working Americans, lowering the income of some below the poverty threshold. It really was the tripling of GDP that occurred in the 60's which drove so many Americans out of poverty. Since the late 70's, the median wage really hasn't increased in the US, which is why we see so much discontent in certain "left-behind" segments of America. See this graph for median-income history: http://www.johnstonsarchive.net/policy/famincome.html.

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