Hen Wonders: How old do Hens have to be to lay Eggs?

I beleive there is some variation between breeds but I usually expect eggs starting around week 22 give or take a few weeks.

Most of our girls started laying around 5-6 months...I think the 16 week time frame is more hopeful than realistic!  I'm sure there are some breeds that lay early, but I have several different types of hens...earliest started around 22 weeks old!  Good luck!

Most usually start around 22 weeks.

That being said, most of mine started at 18 weeks.

It also depends on the breed.  Mine were Black Australorps and Barred Rocks and Easter Eggers (my EE began laying at 17 weeks and they're usually known to start laying much later).

My chickens didn't start laying til 27 or so weeks. I had EE, SLW, and a white leghorn.

You can guess that the pullet will start laying when her comb is bright red.  She may start to squat when you try to pet her or sit in the nest box for a time.  The time when she starts to lay can vary even within the same breed.  My White Leghorn started laying at 19 weeks - but another poster has a WL and she's still not laying at 24 weeks.  So, it can really vary.  My EEs started at 21 weeks old and would sit in the nest box for about 3 days off and on before they actually started to lay.  If there's a rooster - the rooster will start mating her as she gets close to laying.  Sorry, not much help.  But the 16 week time frame is really less realistic then the 22 week that an earlier poster mentioned.  I have one that's 22 weeks old and still hasn't started laying.

My girls started between 18-28 weeks old and I have a Ameracana hen who still hasn't laid and she's 9 months old.  My red stars laid first followed by my turken then my cochin then my 3 OEGB and my seabright then my silkies and my little girls went broody when they laid their first eggs and one of my silkies went broody around Christmas which was about a month or so after she laid her first egg.