Actually it's the opposite. It's well known and studied that richer people lives longer that the poor people, so they get to enjoy the public benefits longer. Also poor people starts to work full time and pay taxes earlier (often as yearly as 16 years of age) than rich people (who often starts working full time only after 27 years of age after schools partially financed by the public). So rich starts paying taxes later than poor and gets to enjoy the benefits longer. If you care about the poor, then you would oppose taxes and public spending.