On the Shelf Judy Blume: A Life By Mark Oppenheimer G.P. Putnam’s Sons, 480 pages, $35 If you buy books linked on our site, The Times may earn a commission from Bookshop.org, whose fees support independent bookstores. One of the biggest takeaways from the biography “Judy Blume: A Life” may not be in the story itself but in its author. Because of her frank talk about puberty and sexual awakenings, Blume’s work is usually associated with young female readers. Her biographer, Mark Oppenheimer, is a middle-aged father of five. He says he received minimal pushback on the idea that a man should be allowed to write Blume’s definitive life story. If the whole point of her books is that there should be no shame in body awareness, what service does it do to say only a woman has the authority to write her story? Plus, although her books aren’t selling as well as they used to — who’s are? — Oppenheimer’s biography points out that there are still plenty of parents who will throw a …