I am over 50, and work outside alot inthe pacific NW. Temps 40-50 cold wet wind and rain. My previous base layers are over 10 years old, it is very hard to find clothes that fit active women who are not yoga models.
I am wearing a mans meduim over another merino baselayer, then a flecce windstop vest. I am comfortable and dry all day.  a good buy, the blue is very dull, I wish I had bought the green.
I will return the womans xl, it also fit perfectly, better in the arm lenght, but the weight of the wool was lighter, and I wanted this as a second layer. Second layers are a bit hard to find.