She didn't mind her little foot spa at allYeah...after the initial 15 seconds of fear, most chickens seem to really enjoy a warm soak...
Is there any way to tell age? Kind of, but not really...lol. It's obvious based on that one spur that she's a hen, not a pullet... If she starts laying, that'll be another clue. I've read that you can check their vent - moist and healthy looking indicates youthful... It's kind of a guessing game. Whether she lays or not, and how often, will probably be your biggest clue...