I’m writing this on my birthday and feeling more than usually grateful.“What do you want to do?” my husband, Peter, asks, as he always does on my birthday.Peter refuses to celebrate his own birthday, but he only applies the no-birthday rule to himself. I am free to celebrate any way I want—so long as I don’t expect any kind of surprise from him.I don’t.And so I tried to think of what would make my day special, and it was hard. Because, these days, all my days are pretty darned special.We just landed in San Miguel de Allende, Mexico, the day ...