According to Uhlenberg, how has the composition of older Americans changed over time?

According to Uhlenberg, how has the composition of older Americans changed over time? What are the four challenges presented by the “lack of fit between the older population and the structure of old age”? What policy options does Uhlenberg outline in his article to address these challenges? In particular, what are the policies that might alter the aging of the population? What policies might increase the productivity or decrease the dependency of the elderly? Do you agree with Uhlenberg’s policy prescriptions? Why or why not?

**Use MLA formatting, and when quoting in the reading, use quotation marks with then the authors name in parentheses when citing in the text.