My Isa Brown hens are about 26 weeks. I got my very first egg from one of them this morning but it was white lol.. and really hard like almost calcified on the outside. I have an older Isa that always gives me smooth brown eggs.. I have 2 ducks in the flock that lay but stopped for the fall season but I am pretty sure it wasn't them because it was up in the chicken nesting box and the ducks have never been able to get up there. Is this normal or do I maybe have a different breed than I thought lol.