What age did your AMERAUCANA first lay?

My Ameraucanas are actually Easter Eggers as most Ameraucanas are (true Ameraucanas are fairly rare, not sold by hatcheries, and lay only blue eggs), but I think that the earliest I've had any of them lay is about 18 weeks old. Most of them started from 20-24 weeks. They typically give me 3-4 eggs per hen per week. They are my granddaughter's favorite chickens. She loves the different colored eggs that they lay.