I'm in the same boat! We have four older chickens (two Delaware, one Red Russian Orloff, and one Barnevelder) that are twelve weeks old yesterday, and thirteen younger pullets (when can you start calling them pullets vs. chicks or hens???) that I believe are about eight or nine weeks old. They're a mix of breeds; ten Golden Lace Wyandottes, two that I'm not sure of, and one that I believe is an Americauna cross. I'm not expecting anything for quite some time, but the other night one of our older twelve-week old Delawares started making that "I'm going to lay an egg" sound and started wandering towards the house. Nothing ended up happening, but we're planning on getting nesting boxes built this weekend just in case!
We're going through a ton of store-bought eggs, and the chickens are eating...and eating...and eating. Hopefully they'll start earning their keep soon!