I do not believe there’s a certain age at which a writer is suddenly prepared to write a memoir, though I sometimes wish the criteria were this easy, this concrete. There are other metrics that could be used: the amount of major events, the degree of trauma or enlightenment, the critical distance the writer has established from the narrative. By that final item, I mean, how close can the writer approach the material before becoming overwhelmed by it or simply unable to draw out its significance. If only this were just a function of time. And if only we could quantify that perfect balance between sentimentality and ambivalence, when the first threatens to make the narrative so saccharine that it’s barely palatable and the second can just make even the most engaging prose flatline.