And all of those aforementioned groups are still reliably STUPID!
Look in the mirror - who is working to teach them otherwise?
Yet there are reasons why people become more conservative as they age:
Experience
Family
Taxes
Awakening
Maturity
Knowledge
Those groups are mostly dependent on the government to subsidize them.
Young people when they get older often become more conservative.
Women once they get married often become more conservative.
Hispanics and blacks once they achieve financial stability and have assets to protect also tend to be more conservative.
The democrats have skillfully used victimology and the race card to hold these classes captive. White man's schooling, white man's laws, white man's justice, and other false ideas sap the ambition of entire groups before they start.