A wry and witty meditation on modernity's obsession with youth and its denigration of maturity In "Why Grow Up? "the philosopher Susan Neiman asks not just why one should grow up but how. In making her case she draws chiefly from the thought of Kant and Rousseau, who articulated very different theories on the proper way to "come of age." But these thinkers complement each other in seeking a "path between mindlessly accepting everything you're told and mindlessly rejecting it," and in learning to live without despair in a world marked by painful realities and uncertainties. Neiman challenges both those who dogmatically privilege innocence and those who see youth as weakness. Her chief opponents are those who equate maturity with cynicism. "In our day it is more common to meet people who are stuck in the mire of adolescence. The world turns out not to reflect the idea and ideals they had for it? So much the worse for ideals." To move beyond these immature positions, Neiman writes, is not simply to lapse into quiet resignation but to learn to take joy and satisfaction in what can be done and known, and to face rather than feel defeated by our inevitable limits.