The fabulous Stana of Femulate brought my attention to this website--where an algorithm will analyze your portrait for femininity/masculinity and age.
I uploaded four of my favorite recent photos and here are the results:
Masculine = 1; feminine = 99; age = 35 (for the record, 28 years below my real age)
Masculine = 2; feminine = 98; no age specified (not sure why)
Masculine = 4; feminine = 96; no age specified
Masculine = 4; feminine = 96; age = 40
As a test, I also uploaded my fave photo of my male self; that came out masculine = 99; feminine = 1; and age = 49.