Well, that's about 20 weeks old, and the days are getting shorter. They lay when they are ready. If you want to stimulate them to lay you can add light. Extend their days 15-30 minutes a week and they will all start laying.
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However, the other three (same hatch date - Ancona, 2 EEs) started laying within the past 2-3 weeks. After the first egg, it's easier to wait on the others.