Estimating the age of women ...

Declan Hughes, in All the Dead Voices, shows the same aptitude and befuddlement at trying to estimate women's ages these days as myself:

"Anne Fogarty was about forty but looked thirty-five, or maybe she was thirty-five and looked her age.  It was hard to tell these days, when 21-year-olds were so primped and groomed and orange-faced they often looked like startled 55-year-old millionaires' wives with too much work done."

All I know is your best keeping any estimates to yourself - whatever you guess, whether it's too young or old it's going to offend in some way.