Our golden age had little to do with politics (maybe indirectly at best). It has a lot more to do with population demographics. Here is the percent of Americans who are of working age (15-65):
Source
1960: 59.7%
1970: 61.9%
1980: 66.2%
1990: 65.9%
2000: 66.2%
2010: 66.9% (near all time peak of 67.2% in 2007)
2020: 64.0% (estimated)
2030: 61.2% (estimated)
2040: 60.7% (estimated)
2050: 60.6% (estimated)
As you can see, our ability to have a high GDP (many workers) with a low burden (few children/retired) peaked in 2007. That was the peak of our ability to have a golden age. This wasn't Bush's fault (or Clinton or Obama). This is just a fact.
Our pyramid-like entitlement programs worked as long as that ratio grew (until 2007). But that time is over. Over for good. Things will be far more bleak from here on out. Entitlements must be curtailed and taxes must go up. Either that or the relatively new concept of a retirement must go.
Note: the small percent changes there are bigger than they seem. When 66.9% of the population is of the working age, each working age person had to carry 0.49 people of non-working age. At 60.6%, each working age person will have to carry 0.65 non-working age people. That is a 31% decline in our lifestyle with just a 6.3% shift in the numbers in the table above.