When do Silkies mature?

[6chick*start]

I recently got my first silkie pair. Not sure age, somewhere between 16-20 weeks.
When can I expect maturity from the boy? How soon after she starts laying can I expect my girl to get broody? I know they are big on brooding and I do want that.
Thanks

 

[6chick*start]

Thought I'd do some research ... egads! I just asked these same questions not long ago. With answers.
Sorry, it's that dang age thing.