Prudence is now, according to her much younger colleague, officially grown up.
So *that's* what 40 is all about.
None of this 40 is the new 30 (or in one case, 21) glibness. It's about being grown up. And Prudence approves.
So long as one has salacious and outrageous enough stories to tell of one's youth, one's advancing age is rather delicious.
Provided one manages to look much younger than one's years, of course.