When do Buff Orpingtons stop growing?

[Chocobo]

There is lots of info about when to expect eggs and when it is safe for chicks to go outside but I'm curious at what point Buff Orpingtons stop growing completely.
My understanding is that they continue to put on weight even after starting to lay eggs so when are they considered "full grown"?

 

[Judy]

As a VERY general rule of thumb, they all continue to grow until around one year, well after they reach full height. Henderson's lists Orpingtons as moderately early maturing.