I read a lot about "a woman of a certain age." I don't know if I understand what, exactly, that age is. I've been 25 and my struggles were vast. Finding my niche in my career, identifying my place in the world, and wondering if I'd ever get married and have a family. I've been 30 and my worries deepened. How do I juggle my growing family and my career? How could my baby thrive when I worked full time and she wouldn't take a bottle? Would I ever have a second child after barely surviving pregnancy? I've been 35 and we'd just built a house. I'd had my third child and graduated to a minivan. I started dancing and thought I could fly. My life was all-consuming and I ignored my husband. I've been 40 and I rediscovered my husband. I just had my 4th child. I had to join Weight Watchers to lose the extra curves. I'd suffered loss and healed. I'd suffered other loss and accepted. I'd started plucking more stray hairs in places beside...